[Problem/Bug]: Composition hosting — mouse and keyboard become unresponsive after repeatedly dragging outside the screen (regression: 151 OK, 152 broken)

What happened?

Win32 composition hosting (ICoreWebView2CompositionController + SendMouseInput + host SetCapture/ReleaseCapture as in the official sample). Press and hold mouse inside WebView, drag cursor outside the screen, release; repeat several times. Eventually mouse and keyboard stop responding to WebView content until restart.

• Runtime 151.0.4129.x: not reproducible / very rare
• Runtime 152.0.4191.x: easy to reproduce with same host binary

Possibly related: #5687 (152 cursor regression), #5613 / #4772 / #5375 (input stuck after drag), #4968 (composition input stuck). Not claiming they are the same bug.

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

Broken: 152.0.4191.53
Last working: 151.0.4129.x (fill exact)

SDK Version

(fill)

Framework

Win32

Operating System

Windows 11

OS Version

(fill, e.g. 10.0.26200)

Repro steps

1. Use composition/visual hosting WebView (official API sample Visual mode preferred).
2. LButton down inside WebView client.
3. Drag cursor beyond monitor / virtual screen edge; release.
4. Repeat 3–10 times.
5. Observe clicks and keyboard no longer work on web content.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Regression in newer Runtime

Last working version (if regression)

151.0.4129.x