Priority and the stack
Many times has it occurred during game play, that multiple triggers go on the stack, and I have responses to make but the game decides that it isn't a legal action when in-fact it is.
Example
Player A. Is in control of a Miirym Sentinel Wyrm and casts a Demanding Dragon which resolves.
Player B. Has no response to the Miirym etb. And then the 2) demanding dragon triggers are left on the stack
Player B. Has a Reassembling Skeleton in play that has the activated ability > (1)(B): Retun Reassembling Skeleton to the battlefield tapped.
Player B. Sacrifices the Reassembling Skeleton to the first Demanding Dragon etb. Which has now resolved, leaving the other Demanding Dragon etb. Still on the stack
Player B. Once again receives priority and should have the availability to activate the Reassembling Skeleton's activated ability before resolving the second Demanding Dragon etb. To have a creature in which to sacrifice to it.
This did not occur and wasn't even an option I reviewed the rules and interactions of all 3 aforementioned creatures on the gatherer, and then the comprehensive rules of the game. Nothing was found to make this situation acceptable when it wasn't.
I have no screen shots to show for this particular event, but by the looks of it timing and priority is a major bug issue across multiple interactions on mtg arena
Due note this issue was found on Mtg Arena mobile
On a android device
App is up to date
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Statist#85993 commented
sometimes you need to enter full control mode to do everything you should be able to do. dunno if thats even possible on mobile version... on pc version full control helped me with a lot of compareable bs