SIGILL when hiding with focus_exited signal while popping up a child window

[Festerdam]

Godot version

v4.1.1.stable.official [bd6af8e]

System information

Godot v4.1.1.stable - Debian GNU/Linux 12 (bookworm) 12 - Vulkan (Forward+) - integrated Intel(R) HD Graphics 5500 (BDW GT2) () - Intel(R) Core(TM) i5-5300U CPU @ 2.30GHz (4 Threads)

Issue description

Attempting to open a child window from a window while having the focus_exited signal connected to the hide method, crashes Godot with signal 4 (SIGILL)
I have a backtrace, though it may not really be useful, since I didn't want to make my own build of godot with debug symbols. I hope however that the MRE makes up for the lack of a proper backtrace on my side.

================================================================
handle_crash: Program crashed with signal 4
Engine version: Godot Engine v4.1.1.stable.official (bd6af8e0ea69167dd0627f3bd54f9105bda0f8b5)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x3bf90) [0x7f586db17f90] (??:0)
[2] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d5f7b6] (??:0)
[3] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d5fa78] (??:0)
[4] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2dfcdf7] (??:0)
[5] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2dfd587] (??:0)
[6] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2dfe1b9] (??:0)
[7] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d98f17] (??:0)
[8] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x47d7128] (??:0)
[9] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x461cac4] (??:0)
[10] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x483b9d1] (??:0)
[11] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2ded3de] (??:0)
[12] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2dede9d] (??:0)
[13] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d365f0] (??:0)
[14] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d7c325] (??:0)
[15] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d7f9ec] (??:0)
[16] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2d802e4] (??:0)
[17] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x2da6ca5] (??:0)
[18] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0xeb6b10] (??:0)
[19] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x45be723] (??:0)
[20] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0x45bf97e] (??:0)
[21] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0xeb71bf] (??:0)
[22] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0xe46433] (??:0)
[23] /lib/x86_64-linux-gnu/libc.so.6(+0x2718a) [0x7f586db0318a] (??:0)
[24] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f586db03245] (??:0)
[25] /home/monix/.local/share/hourglass/versions/4.1.1/godot() [0xe777ae] (??:0)
-- END OF BACKTRACE --
================================================================

What I expect to happen instead:
Either the engine failing with a proper error, or hiding the window, or keeping both windows visible.

Steps to reproduce

Download, and run the MRE
Press the Browse button in the window that appears
Crash occurs

Minimal reproduction project

sigill-mre.zip