I don't know if it's a bug or I'm just stupid, but I have a problem with signals that use the left mouse button. I can use them once and inventory freezes – I can’t interact with it. This applies both to the existing inventory_item_activated signal (when, for example, I use it to transfer_autosplitmerge) and to my own signals. My own signals using RMB (e.g. shift+RMB) work perfectly.
I was able to reproduce this easily in your example (inventory_grid_stacked_ex_transfer.tscn) using the inventory_item_activated signal and split.
Originally posted by @WalbiGulbi in https://github.com/peter-kish/gloot/discussions/178