I just had it happen to me last night and filed a bug report. All WeldConstraints and Motor6Ds in a model I was working on disappeared suddenly.
<All WeldConstraints and Motor6Ds suddenly disappeared while in Studio session
@Scriptos mentioned that if you use the Archimedes plugin there is a glitch in Studio that may get rid of Welds, but it’s the first time that it’s happened to me and I’ve been using Archimedes for years.
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