Reproduction steps:

# Download and unzip the attached “3.12.0.zip“ folder (it contains the Luna package)
# Open a new Unity project
# Open the Package Manager window
# In Package Manager hit the "+" button and choose "Add package from disk"
# Select the {{package.json}} file from the {{scripts}} folder within the folder you unzipped in step 1
# Change the Editor layout by selecting one from the “Layouts” menu (Window>Layouts)

Expected result: The layout is changed without the Editor crashing
Actual result: The Editor crashes

Reproducible with: 2021.2.0a11, 2021.3.8f1, 2022.1.14f1, 2022.2.0b5, 2023.1.0a8
Not reproducible with: 2020.3.38f1, 2021.2.0a10

Reproduced on: Windows 10 Pro

First 5 lines of the stack trace:
0x00007ff648356788 (Unity) GUIView::ProcessInputEvent
0x00007ff64890f0fd (Unity) GUIView::DoPaint
0x00007ff64891869c (Unity) GUIView::RepaintAll
0x00007ff6484879ae (Unity) PlayerLoopController::UpdateScene
0x00007ff648485912 (Unity) Application::TickTimer