Nostalrius Begins - Quality wow vanilla realm (1.12)

Hold Shift then Left click and drag to new bag space brings the whole stack with it(no popup window showing how many you want to split). Tried on 2 different computers. One with Addons, one with none. Tried different toons. Anyone else having this issue?

Try not click-and-dragging. Shift click the stack. select quantity and place desired quantity in the new blag slot.

Wow now I feel dumb... I've been dragging them for years.. Now I can split the stacks. They must have changed this later on. Thanks for your response!