Fix notification unmount thread cancel bug #2212

Job	Run time
Rustfmt, Clippy, Stylua, & Selene	33s
Check MSRV	1m 32s
Build and Test (windows-11-arm)	5m 18s
Build and Test (ubuntu-22.04-arm)	1m 28s
Build and Test (macos-latest)	2m 24s
Build and Test (ubuntu-22.04)	1m 24s
Build and Test (windows-latest)	2m 52s
	15m 31s

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