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Field UI still has calls to $this->instance['widget'] - however, that key does not exist anymore. It currently doesn't crash either because PHP is simply dumb with keys that don't exist on an array.
Postponed on #2014821: Introduce form modes UI and their configuration entity
Comments
Comment #1
yched CreditAttribution: yched commentedShould be fixed in #2056405: Let field types provide their support for "default values" and associated input UI - so, postponed on that one instead :-)
Comment #2
swentel CreditAttribution: swentel commentedYeah there's none of these anymore.