Reagent Bank button does not stack items

[Yufforl]

WoW Freakz link: https://wowwiki.fandom.com/wiki/Reagent_Bank (there is no freakz database link for this)
Bug description: The "deposit all reagents" button doesnt work properly. Example: lets say you have 20 of smth out of a stack of 200 in your reagent bank and another 60 of that same item in your bags; if you press the deposit all button the 60 in your bags wont go on top of the 20 in your bank but create another slot of 60. If your reagent bank is full but you have incomplete stacks of items in it the deposit all button will do nothing even if you have those items in your bags to complete stacks.

TL;DR: Reagent bank doesnt stack your items if you press the button, works if you do it manually.
Proof: Easily tested with any incomplete stack of reagents in your reagents bank.