Export freezes in __search_from_socket

[huwpascoe]

Describe the bug Exporting complicated materials with grouped nodes causes blender to freeze indefinitely.

Tracked it down to __search_from_socket, where the stack randomly goes up and down about 60 levels deep. I've managed to temporarily fix it with hack for my own personal use but this is obviously a serious bug that needs fixing.

.blend file/ .gltf (mandatory) mrp.zip

Version Windows 10 Blender 4.2