Please check this with the support.
I guess you have tested this with the Redshift options off (set to off in R19, saved and then opened in R20) to exclude the problem that might be based on Redshift.
If such a test would show positive, means with out Redshift things work nice, the support of Redshift should be contacted.
Sorry, I’m not supposed to do tech support here, so things stay organized.
All the best