v4.2.dev6 crashes opening 4.1.2 project

[sszigeti]

Godot version

v4.2.dev6.mono.official [57a6813bb]

System information

Windows 11

Issue description

I simply tried to open a v4.1.2 project in v4.2.dev6. It's a purely C# project, a prototype, rather, with some basic 3D experiments (a dice roller, nothing complex).

I should mention that I'm using Godot Jolt as the physics engine, so perhaps this could be relevant.

Upon opening the project and accepting the prompt to have the project upgraded, Godot quits without printing anything, so I started it with --verbose, and I'm attaching this log. I've spotted some weird content which looks like race condition between threads, for example:

UGnoldooatd iEnnggi:n eD ivs4p.o2s.indeg tvra6ck.emdo ninost.aonfcfeisc.i.a.l
.57a6813bb - https://godotengine.org
TeUxntSleoravedirn: g:A dFdiendi sihnetde rdfiascpeo s"iDnugm mtyr"a
cked instances.

I also see a number of "Orphan StringName" errors, which are strange, especially the one that complains about "JavaScriptBridge"

godot_editor_412_project_conversion_log.txt

After this 3 files were changed in my project:

Created: addons\godot-jolt\windows\~godot-jolt_windows-x64_editor.dll

Modified: MyProject.csproj:

- <Project Sdk="Godot.NET.Sdk/4.1.2">
+ <Project Sdk="Godot.NET.Sdk/4.2.0-dev.6">

Created: MyProject.csproj.old.1

Despite these changes, on a repeated attempt Godot has warned me again about having to upgrade the project, then crashed again.

Steps to reproduce

Just tried opening a 4.1.2 project. After a few seconds, Godot quits.

Minimal reproduction project

Sorry, I'd rather not share my prototype here, and I have no idea which part could be relevant, as I can't really interpret the editor's output.

[AThousandShips]

Please run without Jolt to check, issue reports are only considered if the error is from the engine, not third party code

[sszigeti]

Having switched back to the default physics engine, restarting 4.1.2, then deleting the addons directory has fixed the crash: I was able to open the 4.1.2 project in 4.2.dev6, and it seems to behave like it did in 4.1.2.

(I still see the scrambled letters and a number of "Orphan StringName" entries in the log.)

Since the crash has happened because I had an alternate physics engine, I think an error message stating this problem would have been useful.

[AThousandShips]

It is probably related to the physics engine being out of date, also the scrambled output might have hidden such an error, what does the log file say?

[sszigeti]

Attached the --verbose log for the project with the default physics engine.

godot_editor_412_project_conversion_log-without_Jolt.txt

[mihe]

Almost certainly a duplicate of #82810.

[akien-mga]

Indeed, this is not a Godot bug. For now you should remove Jolt to test 4.2 dev snapshots / betas until godot-jolt is updated to support 4.2.