When loading a plugin chain in clips, with one of the plugins “not found” (lets say because the plugin was deleted sometime before), Wavelab 13 crashed when clicking on the plugin.
I remember this issue from before, but thought this was fixed.
I cannot reproduce the problem. Yes, it was one problem in the past, but it is fixed now.
So your case must be a special one.
Is it on Windows or Mac? VST2 or VST3 ? Do you have a crash log?