Image here for reference (takes you to a photo on reddit) The bug is a creature (not called clever conjurer) activating clever conjurer's ability via cauldron attempting to target itself. because of the way the ability is worded, it should be able to untap itself since it is not called Clever Conjurer.
Recreating the situation on Arena leads to the desired result (the creature with Clever Conjurer's ability is able to tap to untap itself creating an infinite loop)
To recreate:
Agatha's soul cauldron with a Clever Conjurer exiled under it.
Any creature (not named clever conjurer) with a +1/+1 counter on it
Desired outcome:
The creature can use the Clever Conjurer's ability to untap itself
Current outcome:
The creature cannot target itself as a legal target
Recreating the situation on Arena leads to the desired result (the creature with Clever Conjurer's ability is able to tap to untap itself creating an infinite loop)
To recreate:
Agatha's soul cauldron with a Clever Conjurer exiled under it.
Any creature (not named clever conjurer) with a +1/+1 counter on it
Desired outcome:
The creature can use the Clever Conjurer's ability to untap itself
Current outcome:
The creature cannot target itself as a legal target