I have this problem too. Has anyone managed to solve it?

I'm having the same problem. It happens when the iPad keyboard appears. If I find a solution then I'll post it here...

EDIT: It occurs to me that this problem is not related to the subject of the thread. I'll make a new thread. Since my last post I've installed iPadOS 14.2 beta 4 on my iPad. Sadly the user presets system remains broken in beta 4. Although the saveUserPreset method does not fail, user presets are not written to the Documents folder, and the userPresets array is invariably empty. To reiterate what I wrote in an earlier post, the user presets system worked in at least one of the pre-release iPadOS 14 betas. I first noticed the problem when iPadOS 14.0 was released publicly.

Thank you, _bismark! That's great news.

It may be worth noting that the userPresets system and the system's implementation of the method used to set the fullState property are still 'broken' in iPadOS 14.0.1. saveUserPreset does not fail or throw an error but does not write any data to the Documents folder either. The userPresets array, which is used to access preset files from the Documents folder, is invariably empty. In my app, the system's implementation of the method used to set the fullState property has no effect at all. Both of these features worked in one of the pre-release iPadOS 14 betas, although I cannot remember which version I used. I first noticed these problems in the release version of iPadOS 14.

I've noticed this too. Moreover, the userPresets system seems to have changed. My audio unit cannot see user presets in iOS14.