Perhaps you have identified a system bug.
Given that you know precisely what you can see - and in what circumstances - you should submit a Bug Report to Apple using their Product Feedback Portal. For iPad and iPadOS:
Feedback - iPad - Apple
This User Tip, authored by one of our senior contributors, may be helpful in documenting the issue:
Writing an effective Apple Support Commun… - Apple Community
When submitting your report via the Portal, please ensure that you include your iPad model and installed version of iPadOS in the body of your report. The pick-list that you’ll select your device details is often does not include the most recent models of iPad and system software versions.