Recovery Mode: Fix PHP warning when accessing plugin data #20494

Job	Run time
Single site / Single site / Default	19m 22s
Multisite / Multisite / Default	19m 1s
Single site / Single site / Memcached	18m 44s
Multisite / Multisite / Memcached	19m 4s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 16m 11s

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