Placing a stack of items onto a slot and immediately shift-clicking it into a container moves all items of that type into the container

For instance, when shift-clicking raw ore into a furnace in split stacks for even smelting, all of the split stack goes into the furnace.
It can be seen in the attached video. I only shift-clicked once on one split stack in the 16 copper, and all 64 went in, even though they are in different item slots. This happened again when placing the remaining 32 into the furnace afterwards.

How to reproduce:

1. Place a container.

2. Give yourself a stack of items of some type.

3. Open the container.

4. Right-click onto the stack to split it.

5. Place the picked up half of the stack onto a slot, then immediately (within 250 milliseconds) shift-click onto that half.
   -> ❌ Both halves of the stack are transferred to the container.

Expected result:

Placing a stack of items onto a slot then immediately shift-clicking it would not count as a double click.

Observed result:

Placing a stack of items onto a slot then immediately shift-clicking it counts as a double click and transfers all items of that type to the other inventory in view.