Fix jupyter-org--parse-latex-element again #75

Job	Run time
test (ubuntu-latest, 26.3)	2m 49s
test (ubuntu-latest, 27.2)	6m 22s
test (ubuntu-latest, 28.2)	1h 22m 32s
test (ubuntu-latest, snapshot)	6m 37s
test (macos-latest, 26.3)	5m 5s
test (macos-latest, 27.2)	4m 32s
test (macos-latest, 28.2)	16m 28s
test (macos-latest, snapshot)	9m 45s
test (windows-latest, 26.3)	7m 7s
test (windows-latest, 27.2)	4m 34s
test (windows-latest, 28.2)	4m 12s
test (windows-latest, snapshot)	4m 17s
	2h 34m 20s

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