Tests

Fix six defects found reviewing the frame reader #4022

Job	Run time
Build and test on ubuntu-latest (numpy 1.26)	3m 32s
Build and test on macos-latest (python 3.12)	4m 37s
Build and test on windows-latest (python 3.12)	7m 54s
Build and test on ubuntu-latest (python 3.14)	4m 13s
Build and test on ubuntu-latest (python 3.12)	5m 26s
	25m 42s

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