SUMMARY soft proofing doesn't work with canvas acceleration turned off. wasn't sure if this was a bug or just a limitation of the feature that isn't mentioned anywhere but wolthera told me to submit a bug report. i downloaded krita 4.4.0 and the same problem is there as well. it works with all different types of acceleration (angle, opengl, software) but as soon as thats turned off soft proofing stops working. os is windows 10.
I can confirm this for appimages 4.3.0 through to the Jan 30 5.0.0 prealpha (git a4a6bbd).