FIX/ENH: a few more fixes for cached/offline mode + plugin only mode #72

Job	Run time
standard / pre-commit checks / pre-commit	27s
standard / Documentation / Python 3.9: documentation building	1m 7s
standard / Conda (3.9, true) / Python 3.9: conda	19m 51s
standard / Conda (3.10) / Python 3.10: conda	16m 44s
standard / Conda (3.11, true) / Python 3.11: conda	16m 54s
standard / Pip (3.10) / Python 3.10: pip	9m 10s
standard / Pip (3.9, true) / Python 3.9: pip	13m 19s
standard / Pip (3.11, true) / Python 3.11: pip	8m 7s
standard / Documentation / Documentation deployment	0s
	1h 25m 39s

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