Grease pencil onion skin colors not working

Support Basics & Interface
#1

Pretty sure this used to just work straight out the box, I can see the onion skinned layers but they’re not tinted as they should be:

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image898×343 66.7 KB

I’m using 2.93.5, any ideas?

#2

Figures it out - GP object by default has ‘use lights’ enabled