After applying the 4.13.1 hotfix some of my materials are being destroyed, with engine nodes such as sin and other pieces being removed from the graph. I have restored from several earlier backups but the behaviour is always the same.
After restoring from a backup the thumbnail of the material looks correct, but as soon as I interact with the material in any way it displays the results of the broken node graph.
Here are two of the broken backups after being destroyed:
The inner space should be full of nodes.
- Is there a way to revert to 4.13.0 or is the hotfix now the default download?
- Is there a known workaround for this?