See https://forums.505go.com/discussion/50230
Here’s my last post on that thread:
Confirmed problem with enter the battlefieldeffect - I just used malevolent whispers to take control of “ghirapool gearcrafters” (spelling is likely wrong).
The gearcrafters bring a thopter into play when they’re cast. When I take control of them, I do NOT get a thopter. When my opponent gets the gearcraftwrs back, they get another thopter.
I took control of the gearcrafters with whispers 2 times in that game, and the issue happened both times.