[Known/Fixed] Liquid Ooze vs Big Root or?

[DemICE 230]

It went like this in my poison monotype run:

I opened my match vs Aya with Venusaur and Roserade (holding a Big Root).
After putting both Tentacruel and Nidoqueen to sleep, I used Leech Seed with Venusaur on Tentacruel while Roserade was setting up Growths.

I realised Tentacruel had Liquid Ooze because Leech Seed was sapping me HP instead of restoring.

After enough growths, Roserade oneshot Tentacruel with Giga Drain (i remembered about Liquid Ooze after i pressed the button), but to my surprise instead of dying, Roserade restored her hp back to full!

So my amateur hypothesis that might help pinpoint the problem:

1) When a pokemon Holds Big root, it wrongly bypasses Liquid Ooze,

2) Bad interaction specifically with Roserade's Giga Drain vs Tentacruel's Liquid Ooze

3) If the pokemon with Liquid Ooze dies by the draining move, the ability does not activate.

4) Some combination of the above, including the fact that the Wasteland field affects Liquid Ooze.

[TaciturnPhoenix 0]

That's strange... Why would Liquid Ooze stop working mid-way through the battle? I feel like your third hypothesis makes the most sense. I think the game might be programmed to recognize certain abilities only if the Pokemon survived the attack (there are exceptions like Aftermath). Leech seed didn't KO the Tentacruel, but Giga drain did. Either way, this is definitely seems like a bug of some sort. Thanks for reporting!

[baldr 32]

Can you load a backup from before the fight and try it again without the Big Root? It could confirm or rule out hypothesis 1.

[Fumble 52]

An occurrence similar to this regarding Liquid Ooze been reported before but I dunno if anyone checked it out and solved the problem: http://www.pokemonreborn.com/forum/index.php?showtopic=19405

Also, Nickaboo had the same problem (though he didn't realize it):

[Marcello 436]

This is known and has been fixed for E16. If anyone is curious as to what specifically the bug was, it was number 3 in the OP's list.