Yareli cannot gain Theorem Arcane stacks while aboard Merulina

[Xandis]

I know it's a extremely specific combination, but as the title says, Yareli (while on Merulina) does not gain any Theorem Contagion/Demulcent/Infection stacks when inside Residual zones. The Theorems will stack and stay active if Yareli gets them before activating Merulina, but they will not increase nor refresh while riding it.

Below is a gif of me entering a pair of Residual Shock zones, gaining a few stacks. After mounting Merulina, I immediately stop gaining stacks and the timers do not refresh. Dismounting Merulina causes the stacks to start increasing again.

https://gfycat.com/warmgrouchycaribou