[1.20.1] Inventory Quick Stack button stacks item, while the keyboard shortcut doesn't

[RegulusCentauri]

Basically as described in the title.
When I use "Quick stack" button from the inventory, the items are deposited in the chests and stacked if possible
When I use the keyboard shortcut (changed it to Shift + X, in case it matters), it deposits the items in the right chest, but doesn't stack them on top of each other, only puts them in the first available slot