Hi.
I can confirm that lowering the door increases PERMANENTLY the Tenacity of our old ugly friend (until the current combat ends, that's it).
Of course, I already know that while the rancor is Toppled with the door, Turn Meter reductions and SOME debuffs cannot land. But even when the Topple turn ends, the door opens again, the panel goes on cooldown and the Rancor returns to normal, he is much much harder to debuff than before.
This are statistical data i gathered around this (Rancor Tier V, 7* team item level 8-10. always same chars Teebo L, Phasma, Rey, GS, Luminara).
Teebo turn meter reductions BEFORE Toppling: 364 tries / 316 success ( +- 87% success rate)
Teebo turn meter reductions AFTER Toppling (once the Rancor frees again): 242 tries / 104 success ( +- 43% success rate)
Phasma Slow applications BEFORE Toppling: 96 tries / 64 success ( +- 67% success rate )
Phasma Slow applications AFTER Toppling (once the Rancor frees again): 65 tries / 23 success ( +- 35% success rate )
Summary: Teebo Turn Meter reduction before dropping the door is on a 87% success rate, after dropping the door (and the rancor frees again), it lowers to 43% success rate only. The sample is not statistically big enough to be precise, but it is for being significant. Simmilar results go for Phasma Slow fusillade.
Also, all my Guild Mates have noticed similar results, and happens with any debuffing eligible character.
Only tested on Rancor levels V and IV, though. I did not track any noticeable difference between phase II and phase III. Phase IV (lacking the door panel) results in a Rancor that is usually harder to debuff than phase II and III before Toppling, but easier to debuff than Rancor on phases II and III after Toppling. Unlike the phase II and III data, this is just speculation based on experience, didn't track data points for this.
I don't know if this is a bug,or an intended behavior, but it's a fact that it is happening.
Regards
A.