Bug: Moving away from the stash (causing the stash and inventory to close) will also close NPC dialogue.
Note: In this example I’m moving to a spot outside of the stash’s “close radius” before initiating dialogue with the NPC. The issue will sometimes occur naturally (depending on pathing) when only clicking the NPC.
Note 2: Issue likely also causes the Inventory window to close when moving from the Shop UI to the Stash.