I'm on mobile and currently I am unaware if there's a way to see who reacted how without pressing on the emoji and adding myself as someone who reacted in the same way.

Also, it doesn't seem to work like upvotes where you can press it again to remove it.

And holding a long press brings up the list of reactors, but it remains on screen in a persistent fashion.

Are these common issues for an average user or is the feature still in development?