For what it’s worth my ftp went up after crit specialty and almost weekly crits after going down a bit between mid-build and the beginning of specialty.
But honestly, these short term gains and losses depend on so many different factors that it’s worth chilling out about them.
In the end, if you lose a bit of fitness but gain race craft, what’s the loss? I am starting to think that season to season progression is a far better indicator of what’s going on. Often we test 5w lower on a ramp test and in the post-workout hangry stage start posts about looming plateaus. 
unless your plateauing when comparing seasons, mild ftp losses every once in a while shouldn’t be a source of stress and are far outweighed by the fun of racing in my opinion!