Bug with May Card

Not sure if this bug has been brought up before, searching "May" doesn't work for obvious reasons. The bug in question was an instance where the May card only drew one Pokemon from my deck, when there were two Pokemon cards in my hand and two remaining Pokemon cards in my deck. I have a theory about what triggers this, but here's the setup:

- only two remaining Pokemon in the deck are Greninja and Greninja EX

- In my hand I have Manaphy and Eiscue

- Suicune EX is in my active spot

- Play May from hand, only Greninja is drawn, only Manaphy is returned to deck

- End Turn, followed by Suicune EX's ability proccing and drawing Greninja EX from deck

My suspicion is that there's an unintended interaction between Suicune EX's ability and May, where the card set to be pulled by the ability is excluded from the set of cards considered for May to pull from. Greninja EX was indeed the card pulled with Suicune EX's ability, so this makes sense to me.

Has anyone else experienced this bug, or is there an existing post?