The fix done in 261404@main isn't quite right; it's possible to enter RemoteLayerTreeEventDispatcher::didRefreshDisplay() after m_momentumEventDispatcher has been nulled out.
<rdar://108105416>
Pull request: https://github.com/WebKit/WebKit/pull/13071
Committed 263321@main (3147f52e6d8d): <https://commits.webkit.org/263321@main> Reviewed commits have been landed. Closing PR #13071 and removing active labels.