I didn't make any changes in the project settings or something, but I did change some GDScript. After I did that, every time I open a different scene in the scene dock the Engine crashes. This right here is the backtrace:
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handle_crash: Program crashed with signal 11
Engine version: Godot Engine v4.2.2.stable.official (15073afe3856abd2aa1622492fe50026c7d63dc1)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x3c050) [0x7fbfbac9c050] (??:0)
[2] godot::SceneTree::get_edited_scene_root() const (??:0)
[3] OrchestratorMainView::_on_scene_tab_changed(int) (??:0)
[4] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x3b38b48] (??:0)
[5] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x3ba02d0] (??:0)
[6] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x15aca36] (??:0)
[7] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x3ba02d0] (??:0)
[8] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x2391ef6] (??:0)
[9] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x23a255d] (??:0)
[10] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x20cdda5] (??:0)
[11] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x2126a2e] (??:0)
[12] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x212884e] (??:0)
[13] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x21376e9] (??:0)
[14] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x420ac0e] (??:0)
[15] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x493d3f] (??:0)
[16] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x3963f82] (??:0)
[17] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x396575f] (??:0)
[18] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x497bfd] (??:0)
[19] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x41e8a6] (??:0)
[20] /lib/x86_64-linux-gnu/libc.so.6(+0x2724a) [0x7fbfbac8724a] (??:0)
[21] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7fbfbac87305] (??:0)
[22] /home/marty/Schreibtisch/Godot_v4.2.2-stable_linux.x86_64() [0x42a59a] (??:0)
-- END OF BACKTRACE --
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I can also share the project files if that would be useful (I plan on open-sourcing it either way). I am using Debain 12 (GNU/Linux) using Gnome. In the backtrace I used Godot 4.2.2, but until just now where the crashes set in, I was using the latest Godot 4.3 dev6 build. So these crashes don't occur because of the dev builds.
SOLUTION: Turns out this problem happened because I was using the Orchestrator plugin (GDExtention plugin, pretty cool visual scripting language). This was causing the crashes. After removing the folder for the orchestrator, that fixed the problem.