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It can be loaded via chrome://extensions/, but the folder cannot be selected when Load unpacked is said.

I don't see the transition line on your site. Perhaps you deleted the label?
In any case, please describe in more detail what needs to be done to reproduce the problem?
Not sure. I have a huge script I have been maintaining for years. All of a sudden this issue appears. I just updated BAS too recently and still getting issues:

Larger scripts of mine will have issues like I cannot select Resources from Insert. I have dealt with that with manual typing. However, I made a new script for this screenshot here. It's not running. I cannot run my scripts because they pause nonstop due to this.