I had it several times now that I went into stealth and I was still hit by a pet spell despite me no longer being a valid target. The pet started the spell, I stealth, the spell still goes through.
I believe it is not intentional for it work this way as other fixes were made to eliminate similar behavior.
For example: 2019-06-27 Thursday
- stealth outside the detection range / vanish should now also clear the target of already drawing ranged weapon players thereby preventing the shot
2019-06-15 Saturday
- fixed an issue causing pets to ignore stealth under some circumstances
2019-01-30 Wednesday
- flute mezz pulse now cancels when the target is stealthed and not in detection range