How to reproduce:
1. Create new project
2. Add any empty UI object to Scene
3. Select the game object and in Inspector add TMP input field (not UI type)
4. Ctrl-z once to undo that and add the same component again
5. Observe Console

Error:
MissingReferenceException: The object of type 'MeshRenderer' has been destroyed but you are still trying to access it.
Your script should either check if it is null or you should not destroy the object.

Reproduced with: 2020.3.26f1, 2021.2.7f1, 2022.1.0b6

Note: once this is done, every time you open any UI object with Mesh Renderer keeps throwing this.