Since the Steam Client Beta update on March 10th, the Steam overlay UI does not respond to clicks when the game uses WM_POINTER events (e.g. Unity Legacy Input System).
Expected Behavior
User opens Steam overlay
User clicks on overlay UI
Overlay receives WM_POINTER event → processes the click on overlay UI → stops propagation to game
Actual Behavior
User opens Steam overlay
User clicks on overlay UI
WM_POINTER event is dropped entirely — overlay UI does not respond to the click at all
Root Cause (suspected)
The March 10th update was intended to prevent WM_POINTER events from passing through the overlay to the game. However, the overlay itself also fails to process the events — they are discarded without being consumed, making the overlay UI unclickable.
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Summary
Since the Steam Client Beta update on March 10th, the Steam overlay UI does not respond to clicks when the game uses WM_POINTER events (e.g. Unity Legacy Input System).
Expected Behavior
Actual Behavior
Root Cause (suspected)
The March 10th update was intended to prevent WM_POINTER events from passing through the overlay to the game. However, the overlay itself also fails to process the events — they are discarded without being consumed, making the overlay UI unclickable.
Reproduction Environment
Regression
This worked correctly before the March 10th Steam Client Beta update.
Reference: https://steamcommunity.com/groups/SteamClientBeta/announcements/detail/503977720511727999