Exception when removing a work_item child

When removing a child from a work_item we're getting

app/models/concerns/work_item_resource_event.rb:33:in `synthetic_note_class'

https://log.gprd.gitlab.net/app/discover#/doc/7092c4e2-4eb5-46f2-8305-a7da2edad090/pubsub-rails-inf-gprd-022057?id=8vf_DJABbXY-YHnaw79f