Found a bug with Ugin's Nexus attempting to add an extra turn, but doesn't actually give the extra turn when sacrificed, only giving the icon that says it would give an extra turn, but just skips to the opponent's turn.

This is on Brawl on PC MtgArena.

I manage to replicate this multiple times in a match live with these board pieces:
-Ugin's Nexus
-Sai, Master Thopterist
-Esoteric Duplicator (optional for infinite turns, and gives token example that also doesn't work)

What is happening:
1. Using Sai to sac the Ugin's Nexus, Ugin's Nexus exiles itself, giving the icon that you get an extra turn.
2. Proceed to pass to Extra turn
3. Trigger fizzles and game passes to opponent's turn instead.

Expected Result:
1. Using Sai to sac the Ugin's Nexus, Ugin's Nexus exiles itself, giving the icon that you get an extra turn.
2. Proceed to pass to Extra turn
3. Continue with the Extra Turn

The same effect happens when trying to loop this mechanic with Esoteric Duplicator:

What is happening:
1. Using Sai to sac the Ugin's Nexus, Ugin's Nexus exiles itself, giving the icon that you get an extra turn.
2. Trigger Esoteric Duplicator, paying the 2 mana to create a token copy of Ugin's Nexus as the end step.
3. Proceed to pass to Extra turn
4. Trigger fizzles and game passes to opponent's turn instead.

Expected Result:
1. Using Sai to sac the Ugin's Nexus, Ugin's Nexus exiles itself, giving the icon that you get an extra turn.
2. Trigger Esoteric Duplicator, paying the 2 mana to create a token copy of Ugin's Nexus as the end step.
3. Proceed to pass to Extra turn
4. Continue with the Extra Turn