It might not be a bug, it it is unexpected behavior. And should maybe be in the docs for
IDropHandler
Found a video made in Unity 2019.2.6f1 where this issue is not present
I can’t find any issue related to IDropHandler and IPointerDownHandler in the Public Issue Tracker (1, 2).
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Case 1255936
Thanks a lot for the report! The team was able to reproduce it and will forward it to the developers.
Here’s the issue tracker link: Unity Issue Tracker - IDropHandler is not triggered when the dragged object has IPointerDownHandler implemented
well I had the same %#%$ issue, I was searching for a long time, I updated my unity from 2019 to 2020 and I found then today after 4 days that they made this bug…
Solution: I removed the IPointerDownHandler and that is all, my game is working again after that…
uGUI: IDropHandler is not triggered when the dragged object has IPointerDownHandler implemented (1255936)