Thank you for reporting a bug to Unity.
After reviewing the behavior, we've confirmed it aligns with the current design and intended use of the feature. We understand this may differ from your expectations or workflow.
These errors occur as a result of loading a scene that contains an EventSystem that is configured to use the legacy input system when the project itself is configured to use the new Input System package with the Player Settings - Active Input Handling set to exclusively use the new Input System.
Clicking on any of these errors brings up the EventSystem in the Inspector, revealing a message that informs the user of the source of these errors and option to resolve this. This behavior is by design and not related to TextMesh Pro but instead related to the EventSystem and input systems.
We will close this case as 'As Designed.' If you have feedback on how the feature could better meet your needs, please let us know - we value your input and consider it in future improvements.