Fix `on_track` deadlock #1757

Job	Run time
dartanalyze	1m 21s
build (macos)	2m 7s
build (linux)	1m 58s
build (windows)	2m 2s
clippy (linux)	1m 43s
clippy (macos)	1m 10s
dartfmt	1m 15s
clippy (windows)	1m 55s
ktfmt	26s
dart pub publish (pub.dev)	12s
rustfmt	20s
rustdoc (linux)	2m 6s
rustdoc (macos)	2m 7s
rustdoc (windows)	1m 52s
swiftformat	25s
release (GitHub)	0s
test (example, ${{ matrix.platform }})	1s
pr	1s
	21m 1s

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