Fix notification unmount thread cancel bug #2214

Job	Run time
Check MSRV	1m 30s
Build and Test (macos-latest)	1m 37s
Build and Test (windows-11-arm)	5m 16s
Build and Test (ubuntu-22.04)	1m 3s
Build and Test (windows-latest)	2m 59s
Rustfmt, Clippy, Stylua, & Selene	34s
Build and Test (ubuntu-22.04-arm)	1m 21s
	14m 20s

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