Crash in debug mode: dragging a brush layer into a boolean operation layer

https://github.com/user-attachments/assets/38562fa1-265c-46ef-9c02-601d3d195361

It doesn't always happen in a localhost debug build, and never happens in a production build. If you have trouble reproducing it from the video instructions above, here is a file where the last step of dragging the brush layer into the boolean layer will produce the crash:

[crash.graphite.txt](https://github.com/user-attachments/files/22226091/_crash.graphite.txt)

Start with the attached _crash.graphite.txt file and the video instructions, then reproduce the final drag in a localhost debug build by moving a brush layer into a boolean operation layer. Compare the debug behavior with a production build and trace the resulting crash; done means the operation no longer crashes in debug mode.

Written by the indexing model from the issue text.