I have an OCIO environment variable pointing to ACES 1.0.3 config, which I share between other DCC software in my pipeline. Up to SP version 8.1.3 (or maybe 8.1.2?) it was possible to customize defaults in "Color Settings", "Bitmap import color space defaults", "Substance materials" and "Export color spaces" sub-sections of the "New Project" window's "Color Management" section. This has worked ever since OCIO support was introduced in SP.
Something has changed however, and currently it's no longer possible to do this, because for some reason all dropdown lists are grayed out. Of course the defaults are completely wrong, so my pipeline is broken at the moment.

Was there any change introduced lately that now prevents from modifying OCIO defaults if OCIO envar is set? If so, then what was the rationale?
Or is it a bug?
(Steam, SP 8.1.3, Debian Bookworm)