Fix regression in flipbook #567

Job	Run time
Coverage	4m 35s
Check format	1m 19s
run-examples	13m 14s
build (2d, stable, windows-latest)	8m 55s
build (2d, stable, ubuntu-latest)	12m 55s
build (2d, stable, macos-latest)	3m 21s
build (3d, stable, windows-latest)	8m 9s
build (3d, stable, ubuntu-latest)	12m 31s
build (3d, stable, macos-latest)	7m 49s
build (all, stable, windows-latest)	8m 8s
build (all, stable, ubuntu-latest)	8m 13s
build (all, stable, macos-latest)	5m 6s
	1h 34m 15s

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