Backport PR #3296 on branch v4.1.x (fix unmix state when changing value) #11481

Job	Run time
Code style checks	16s
PEP 517	19s
Security audit	20s
Python 3.11 with coverage checking, all deps, and remote data	32m 34s
OS X - Python 3.12	9m 1s
Windows - Python 3.10	20m 27s
Python 3.12 with latest dev versions of key dependencies, and remote data	28m 13s
Python 3.11 with stable versions of dependencies and Roman	12m 51s
Upload Coverage	8s
	1h 44m 9s

Provide feedback