Fix cross-entropy tests and leakage issue #470

Job	Run time
test (3.8, ubuntu-latest, test)	6m 51s
test (3.8, ubuntu-latest, test-full)	8m 47s
test (3.8, windows-latest, test)	8m 1s
test (3.8, windows-latest, test-full)	10m 19s
test (3.9, ubuntu-latest, test)	6m 19s
test (3.9, ubuntu-latest, test-full)	8m 59s
test (3.9, windows-latest, test)	8m 6s
test (3.9, windows-latest, test-full)	11m 25s
test (3.10, ubuntu-latest, test)	6m 26s
test (3.10, ubuntu-latest, test-full)	8m 29s
test (3.10, windows-latest, test)	7m 52s
test (3.10, windows-latest, test-full)	11m 2s
test (3.11, ubuntu-latest, test)	5m 57s
test (3.11, ubuntu-latest, test-full)	8m 4s
test (3.11, windows-latest, test)	8m 13s
test (3.11, windows-latest, test-full)	9m 45s
test (3.12, ubuntu-latest, test)	6m 35s
test (3.12, ubuntu-latest, test-full)	17m 25s
check-format / check	15s
test (3.12, windows-latest, test)	7m 49s
test (3.12, windows-latest, test-full)	14m 35s
	3h 1m 14s

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