“Debug location is approximate because the source is not available” in R 4.0.0 + RStudio

I recently posted this question on stackoverflow but I believe the question is better suited for this forum as the issue seems to be related to the RStudio IDE.

Any hints/suggestions/ideas are welcome!

Best Manuel

If you are going to cross post, please make sure to follow the forum policy, is not ok to just drop a link to an SO question.

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Yes, I'll do my best to stick to the forum policy. In this case, posting the question here - although only by link - seemed to have helped draw @jonathan attention to the post.
He tracked down the bug. His answer can be found on SO. The accompanying GitHub issue can be found here.

Thanks for all your help!