There should be a feature where you can move multiple stacks of the same item from your inventory to a chest (and vice versa)
Example: https://youtu.be/fF_KEAe988M?t=205
It was confirmed to be a bug by Helen Zbihlyj in Minecraft Discord chat
MCPE-42579
Inventory
Resolved
Invalid
0
(Unassigned)
Unconfirmed
Windows
1.12.0.2 Beta, 1.9.0, 1.11.0.1 Beta, 1.11.0.3 Beta, 1.10.0, 1.11.0
Retrieved
Thank you for your report!
However, this issue has been closed as Invalid.
We're already working on achieving parity across versions where possible, and we're very keen to hear your requests or suggestions, so we'd encourage you to make a post at https://feedback.minecraft.net, or upvote an existing topic there.
If you're not sure whether your issue is a parity request or a bug, hopefully this article will help explain further: Parity Request Guide
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