Hi sorry for the long wait.
There have been some fixes for welding code which should be in the 4.7 preview so I’d be curious to know if the issue still happens (though it sounds like you can’t repro it).
The welding code needs a big refactor which makes some of the logic hard to follow.
We have a plan to do this in the coming year which will hopefully help with a lot of these issues.
Please let me know if this is still crashing, sorry for the pain!