As Dave says, it's not just SketchUcation - many extensions will fail with MAC's Catalina - it is not compatible with ANY version of SketchUp.
It's also not just extensions, the whole SketchUp app is subject to flakiness with Catalina...
I know that they are working on a Maintenance Release for SketchUp v2019 to address this well known OS MAC issue.
So currently you cannot safely use ANY SketchUp version with Catalina - it might work - but chances are it'll fall down unexpectedly.
Also they only plan to update v2019 to be compatible, so if you have v2018 or earlier versions, then Catalina is never going to become fully compatible.
Once a v2019 that works is out you either have to swap over to that or if you are stuck with an earlier version [because of licensing etc or you are using v2017make] then you need to roll-back to the previous MAC OS, and not upgrade...