Are 4K Discs starting to get region locked?

I can confirm that US release of Fall (2022) 4K UHD disc is locked to region A.

Loading the disc in a region B UHD player displayed a screen with helpful ( :LOL: ) information "Mismatch between disc and player region codes. See disc packaging for details."

Switching the player to region A obviously solved this issue.

Fall is a Lionsgate release in the US.