It seems that this is only up to 26.2. In 26.3.1 it seems fixed and the behavior of the indicator bubble is the same as up to 18. So it was most likely a bug that has been fixed now.

It is still an issue on iPadOS 26.3.1. While it works on and iPhone with iOS 26.3.1 like pre 26, the initially described problem does still exists on an iPad with 26.3.1.