I do not see this, but looks like the old tree error.
Reported by @jrieken
ERR TreeError [FileExplorer] Tree element not found: [object Object]: Error: TreeError [FileExplorer] Tree element not found: [object Object]
at CompressedObjectTreeModel.getCompressedNode (file:///Users/jrieken/Code/vscode/out/vs/base/browser/ui/tree/compressedObjectTreeModel.js:223:23)
at CompressedObjectTreeModel.isCollapsible (file:///Users/jrieken/Code/vscode/out/vs/base/browser/ui/tree/compressedObjectTreeModel.js:187:41)
at CompressibleObjectTreeModel.isCollapsible (file:///Users/jrieken/Code/vscode/out/vs/base/browser/ui/tree/compressedObjectTreeModel.js:332:31)
at CompressibleObjectTree.isCollapsible (file:///Users/jrieken/Code/vscode/out/vs/base/browser/ui/tree/abstractTree.js:1104:31)
at WorkbenchCompressibleAsyncDataTree.expand (file:///Users/jrieken/Code/vscode/out/vs/base/browser/ui/tree/asyncDataTree.js:359:28)
at async ExplorerView.onSelectResource (file:///Users/jrieken/Code/vscode/out/vs/workbench/contrib/files/browser/views/explorerView.js:505:17)
I do not see this, but looks like the old tree error.
Reported by @jrieken