RTC: Backport fix to prevent autosaves from losing content. #35570

Job	Run time
Determine Matrix	5s
Multisite Default / Test current	13m 36s
Single Site Default / Test before	13m 24s
Multisite Default / Test before	14m 6s
Multisite Memcached / Test before	14m 0s
Multisite Memcached / Test current	14m 3s
Single Site Memcached / Test before	13m 38s
Single Site Memcached / Test current	14m 17s
Single Site Default / Test current	14m 23s
Compare / Single Site Default	14s
Compare / Single Site Memcached	12s
Compare / Multisite Memcached	12s
Compare / Multisite Default	11s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 52m 21s

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