Collection Achievement is 2% normal exp. During 50% bonus exp, this changes to 3%. Bonus exp was applied to Collection Achievement as recent as November 2022. But it is still 2% and not 3% after bonus exp started on 16 March 2023. Is this intended?
It's just the reward preview that doesn't factor in the bonus experience (or perk bonus). The actual reward should still give the increased amount. This is already on The List™ to be fixed, though I don't have an ETA.