Cryptomatte layers all grey instead of pure white

[Jpjapers]

Im having a really weird issue with cryptomatte in photoshop from a CXR and the EXR.io plugin.
Every single mask layer is greyscale instead of pure white meaning whe used as masks, the resulting layer is semi transparent.
I have no idea whats causing this.

Any ideas? Im completely stuck without it.

[romullus]

I think i've read somewhere in the forum that this has to do with colour management settings in 3ds Max. Can't recall the solution unfortunately, cause it's irrelevant to me - i'm working in gamma 2.2 (legacy) and don't have plans to switch in the foreseeable future.

[Jpjapers]

Ive not got anything enabled out of the standard workflow, but perhaps i need to. Ill do some tests when i have some time!