42d65dd7ffc360a2bc5c9b35eeaed29c01d4fe3c
The problem here was that the extra forward compatibility data for node groups (links to the node interface sockets) was written for files as well as undo memfiles. But only in the case of true .blend files is this data subsequently removed again after loading, which in the case of undo leaves invalid links hanging around in the node tree. Forward compat data is now skipped for undo.
Description
No description provided
Languages
C++
78%
Python
14.9%
C
2.9%
GLSL
1.9%
CMake
1.2%
Other
0.9%