Doesn't affect Carousel, but user programs might run into it.
D4TR5GCSS5P56SB7GOAH26S7OYMWQI3KZ2XB7QUZJZBHCKWK5OJAC
OC4P6P36KEBO2FIYTKXUQOP6VSQRFONDCLSZDGN7ZNYN23UMNH7AC
if State.slider_handlers == nil then return end -- very first frame