Crash + Json: Tileset rectangles are able to point to a nonexistent tileset definition

Crash For any instances where TilesetRectangle icon is used (IntGridValueDefinition, EnumValueDefinition, EntityDefinition, FieldInstance AutoLayerRuleGroup), If I delete its tileset definition, but check back on it to readjust, I get a crash, likely due to reading a tileset definition that has become null. (see video)
Json In addition to the crash, these rectangle objects can have their uid still point to a uid tileset that no longer exists, which can cause unexpected behaviour in an importer. I can safely check if the definition doesn't exist if the uid isn't in its dictionary lookup, but it hasn't been a scenario I've had to account for before. I think the right thing to do in this situation is: "When a tileset definition is deleted, for all tileset rectangles that use this tileset def, turn them null"

https://github.com/deepnight/ldtk/assets/55564581/e906fa82-78b2-4921-bd45-3d1023ac0575

Stack:

LDtk version: 1.5.3-64bits
Cannot read properties of undefined (reading 'embedAtlas')
TypeError
TypeError: Cannot read properties of undefined (reading 'embedAtlas')
    at ui_modal_panel_EditEntityDefs.updateEntityForm (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:303398:10)
    at ui_modal_panel_EditEntityDefs.selectEntity (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:303011:8)
    at new ui_modal_panel_EditEntityDefs (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:302847:9)
    at page_Editor.onAppCommand (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:234605:5)
    at App.executeAppCommand (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:3632:24)
    at HTMLButtonElement.<anonymous> (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:233079:11)
    at HTMLButtonElement.dispatch (C:\Users\cameo\AppData\Local\Programs\ldtk\resources\app.asar\assets\js\jquery.min.js:2:43064)
    at v.handle (C:\Users\cameo\AppData\Local\Programs\ldtk\resources\app.asar\assets\js\jquery.min.js:2:41048)

Processes:

#0 App
 |--- #2 page.Editor
       |--- #3 misc.FileWatcher
       |--- #4 display.WorldRender
       |--- #5 display.LevelRender
       |--- #6 display.Camera
       |--- #7 display.Rulers[--]
       |--- #8 tool.SelectionTool[--]
       |--- #9 tool.lt.DoNothing[--]
       |--- #10 WorldTool
       |--- #11 tool.PanView[--]
       |--- #12 tool.lt.EntityTool[--]
       |--- #102 ui.modal.panel.EditTilesetDefs
       |--- #109 ui.LastChance
       |--- #110 display.EntityRender
       |--- #111 display.EntityRender
       |--- #112 display.EntityRender
       |--- #113 display.EntityRender
       |--- #114 display.EntityRender
       |--- #115 display.EntityRender
       |--- #116 display.EntityRender
       |--- #117 display.EntityRender
       |--- #118 display.EntityRender
       |--- #119 display.EntityRender
       |--- #120 display.EntityRender
       |--- #121 display.EntityRender
       |--- #122 display.EntityRender
       |--- #123 display.EntityRender
       |--- #124 display.EntityRender
       |--- #125 display.EntityRender
       |--- #126 display.EntityRender
       |--- #127 display.EntityRender
       |--- #128 display.EntityRender
       |--- #129 display.EntityRender
       |--- #130 display.EntityRender
       |--- #131 display.EntityRender
       |--- #132 display.EntityRender
       |--- #133 display.EntityRender
       |--- #134 display.EntityRender
       |--- #135 display.EntityRender
       |--- #136 display.EntityRender
       |--- #139 ui.Tip
       |--- #140 ui.modal.panel.EditEntityDefs

Log:

[USERACTION]   Closed panel #87 ui.modal.panel.EditTilesetDefs
[FILE]         Reading HTML template editEntityDefs from cache
[FILE]         Reading HTML template fieldDefsForm from cache
[FILE]         Reading HTML template pivotEditor from cache
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[FILE]         Reading HTML template pivotEditor from cache
[FILE]         Reading HTML template pivotEditor from cache
[FILE]         Reading HTML template pivotEditor from cache
[FILE]         Reading HTML template pivotEditor from cache
[FILE]         Reading HTML template pivotEditor from cache
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[USERACTION]   Opened panel #102 ui.modal.panel.EditTilesetDefs
[USERACTION]   Closed panel #92 ui.modal.panel.EditEntityDefs
[FILE]         Reading HTML template editTilesetDefs from cache
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[WARNING]      Last chance for: Tileset SunnyLand_by_Ansimuz_extended deleted
[EVENT]        TilesetDefRemoved 199
[EVENT]        LevelJsonCacheInvalidated
[RENDER]       Rendering world level fields data.Level#f80e4bc0-66b0-11ec-b121-b327a018109c "Entities_demo"...
[WARNING]      Full level render requested
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[RENDER]       Rendering world bg...
[USERACTION]   Opened panel #140 ui.modal.panel.EditEntityDefs
[USERACTION]   Closed panel #102 ui.modal.panel.EditTilesetDefs
[FILE]         Reading HTML template editEntityDefs from cache
[FILE]         Reading HTML template fieldDefsForm from cache
[GENERAL]      Page started: page.CrashReport()
[FILE]         Loading page template: crashReport from C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/tpl/pages/crashReport.html
[ERROR]        Cannot read properties of undefined (reading 'embedAtlas') (TypeError)
[ERROR]        TypeError: Cannot read properties of undefined (reading 'embedAtlas')
    at ui_modal_panel_EditEntityDefs.updateEntityForm (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:303398:10)
    at ui_modal_panel_EditEntityDefs.selectEntity (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:303011:8)
    at new ui_modal_panel_EditEntityDefs (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:302847:9)
    at page_Editor.onAppCommand (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:234605:5)
    at App.executeAppCommand (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:3632:24)
    at HTMLButtonElement.<anonymous> (file:///C:/Users/cameo/AppData/Local/Programs/ldtk/resources/app.asar/assets/js/renderer.js:233079:11)
    at HTMLButtonElement.dispatch (C:\Users\cameo\AppData\Local\Programs\ldtk\resources\app.asar\assets\js\jquery.min.js:2:43064)
    at v.handle (C:\Users\cameo\AppData\Local\Programs\ldtk\resources\app.asar\assets\js\jquery.min.js:2:41048)

[GENERAL]      
#0 App
 |--- #2 page.Editor
       |--- #3 misc.FileWatcher
       |--- #4 display.WorldRender
       |--- #5 display.LevelRender
       |--- #6 display.Camera
       |--- #7 display.Rulers[--]
       |--- #8 tool.SelectionTool[--]
       |--- #9 tool.lt.DoNothing[--]
       |--- #10 WorldTool
       |--- #11 tool.PanView[--]
       |--- #12 tool.lt.EntityTool[--]
       |--- #102 ui.modal.panel.EditTilesetDefs
       |--- #109 ui.LastChance
       |--- #110 display.EntityRender
       |--- #111 display.EntityRender
       |--- #112 display.EntityRender
       |--- #113 display.EntityRender
       |--- #114 display.EntityRender
       |--- #115 display.EntityRender
       |--- #116 display.EntityRender
       |--- #117 display.EntityRender
       |--- #118 display.EntityRender
       |--- #119 display.EntityRender
       |--- #120 display.EntityRender
       |--- #121 display.EntityRender
       |--- #122 display.EntityRender
       |--- #123 display.EntityRender
       |--- #124 display.EntityRender
       |--- #125 display.EntityRender
       |--- #126 display.EntityRender
       |--- #127 display.EntityRender
       |--- #128 display.EntityRender
       |--- #129 display.EntityRender
       |--- #130 display.EntityRender
       |--- #131 display.EntityRender
       |--- #132 display.EntityRender
       |--- #133 display.EntityRender
       |--- #134 display.EntityRender
       |--- #135 display.EntityRender
       |--- #136 display.EntityRender
       |--- #139 ui.Tip
       |--- #140 ui.modal.panel.EditEntityDefs
 |--- #141 page.CrashReport

[FILE]         Cleared all file watches

deepnight / ldtk

Crash + Json: Tileset rectangles are able to point to a nonexistent tileset definition #1107