Stashing gears button missing

I have observed that some maps do not have the stash button (triangle) available when depositing gears to the stash. I have seen them in the following maps so far:
1. Start of act 3
2. At the entrance of trials of chaos

There may have be another one which I have failed to document.

Triangle button is now drop instead of stash after update\hotfix. Dragging every single item into stash is a horrible game experience.

Thread poster is correct. Stash button is available in Acts 1 & 2 but not in 3.