Everything is working fine again with iOS 26.1 Beta 2 (23B5059e) :)

I just tested it with iOS 26.1 Beta and Xcode version 26.0.1 (17A400). The problem still exists.

@DTS Engineer Is there a link to the original bug report?

Same here with iOS 26 Final Version. Thought it would be an issue with my project but it's the same with a newly created empty sample extension project. I even created a new team for the signing which also didn't help. ☹️ Would be nice if this could be fixed. 🙏