Editing displacements replaces all detailsprites with error textures

[14bit]

Describe the bug:

In build 8864 for TF2, any time a displacement with detailsprites is edited, all detailsprites of that type in Hammer++ will be replaced with error textures. This persists across maps that share that detailsprite, and can only be fixed by closing Hammer++ and reopening it. Closing and reopening the .vmf does not fix it.

Steps to reproduce:

1. Open a .vmf that has displacements with detailsprites (I am using a decompiled Mountainlab from TF2 for these images)
2. Select a displacement with detailsprites, and open the Displacement Paint Geometry tool
3. Modify the geometry of the displacement

Expected behavior:

For detailsprites to not be replaced with errors when editing displacements.