FIX Don't try to save blocks in a readonly elemental area #638

Job	Run time
CI / Context	1s
CI / Generate matrix	15s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 48s
CI / 8.2 mariadb phpunit all	3m 21s
CI / 8.3 mysql80 phpunit all	3m 19s
CI / 8.3 mysql84 phpunit all	3m 7s
CI / 8.1 mysql57 phplinting	2m 4s
CI / 8.1 mysql57 endtoend root job1	8m 37s
CI / 8.3 mysql80 endtoend root job1	8m 38s
CI / 8.1 mysql57 endtoend root job2	8m 15s
CI / 8.3 mysql80 endtoend root job2	7m 57s
CI / 8.1 mysql57 endtoend root job3	9m 31s
CI / 8.3 mysql80 endtoend root job3	9m 35s
CI / 8.1 mysql57 endtoend root job4	9m 28s
CI / 8.3 mysql80 endtoend root job4	9m 30s
CI / 8.1 mysql57 endtoend root job5	7m 20s
CI / 8.3 mysql80 endtoend root job5	7m 5s
CI / 8.1 mysql57 endtoend root job6	8m 0s
CI / 8.3 mysql80 endtoend root job6	8m 5s
CI / 8.1 mysql57 endtoend root job7	20m 0s
CI / 8.3 mysql80 endtoend root job7	10m 56s
CI / 8.1 mysql57 js	4m 52s
CI / 8.1 mysql57 doclinting	2m 51s
CI / Dispatch tag patch release	0s
	2h 35m 36s

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