Hello.
1) navigate to single video page on mobile (iOS 15,3 iPhone 11)
2) find reaction button
3) hold finger on reaction button
4) wait for 6 reactions display
5) press on any 1 of 6 reaction on top area of it (like green line at screenshot)
Result: in fact it will not work. Will be open link of previous / next video that beyond this reaction.

I suppose there is something wrong with z-index.

Thanks.