Fix sync hang #5493

Job	Run time
Reject trailing whitespace	5s
Run doc tests	2m 0s
cargo-checkmate / Cache checkmate	7s
test / Build test artifacts	6m 19s
cargo-checkmate / Cargo checkmate (build)	2m 57s
cargo-checkmate / Cargo checkmate (check)	1m 51s
cargo-checkmate / Cargo checkmate (clippy)	1m 47s
cargo-checkmate / Cargo checkmate (doc)	2m 52s
cargo-checkmate / Cargo checkmate (format)	24s
test / Run tests (1)	1m 39s
test / Run tests (2)	1m 40s
test / Run tests (3)	1m 38s
test / Run tests (4)	1m 40s
test / Run tests (5)	1m 39s
test / Run tests (6)	1m 31s
test / Run tests (7)	1m 38s
test / Run tests (8)	1m 38s
	31m 25s

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