DS 4.22 changes to how ghost lights work?

Before submitting a bug report I wanted to check if anyone else is having this problem. 
Since updating to 4.22.0 I have had a problem with cutout opacity and luminance on surfaces. 
I first noticed the issue with hair that looked buggy. Setting the hair to 0.99 cutout opacity rather than 1.0 fixed this. 

A lot of my scenes use ghost lights made from flat planes set to 0.00001 opacity, with luminance set very high, on the ceiling of a room. 
Now these scenes appear much darker than they did in previous versions of DS.
This is a problem with continuity for my project which requires new content in these old scenes... I can no longer get the lighting to match. 
These scenes were saved in 2022 on version 4.15 (if I remember correctly) and now opening them, the lighting is much darker. 

Can anyone else confirm this problem before I try downgrading DS or chasing other causes of the issue?

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