Fix share label group overrides #2318

Job	Run time
run-if-changes	6s
get-versions	15s
build (3.13, 3.9) / Test Python 3.13 with MPL 3.9	6m 48s
build (3.13, 3.9) / Compare baseline Python 3.13 with MPL 3.9	22m 34s
build (3.12, 3.9) / Test Python 3.12 with MPL 3.9	6m 36s
build (3.12, 3.9) / Compare baseline Python 3.12 with MPL 3.9	18m 23s
build (3.10, 3.10) / Test Python 3.10 with MPL 3.10	6m 58s
build (3.10, 3.10) / Compare baseline Python 3.10 with MPL 3.10	23m 25s
build (3.11, 3.9) / Test Python 3.11 with MPL 3.9	5m 16s
build (3.13, 3.10) / Compare baseline Python 3.13 with MPL 3.10	20m 37s
build (3.12, 3.10) / Test Python 3.12 with MPL 3.10	6m 45s
build (3.11, 3.10) / Compare baseline Python 3.11 with MPL 3.10	22m 29s
build (3.11, 3.9) / Compare baseline Python 3.11 with MPL 3.9	22m 18s
build (3.10, 3.9) / Compare baseline Python 3.10 with MPL 3.9	22m 37s
build (3.12, 3.10) / Compare baseline Python 3.12 with MPL 3.10	21m 42s
build (3.13, 3.10) / Test Python 3.13 with MPL 3.10	7m 4s
build (3.10, 3.9) / Test Python 3.10 with MPL 3.9	6m 52s
build (3.11, 3.10) / Test Python 3.11 with MPL 3.10	6m 40s
build-success	2s
	3h 47m 27s

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