FormEngine does not allow saving dynamic items and does not preselect dynamic items based on column value
FormEngine aka TCEforms
Same exact issue as described in #76147 with two points of additional info:
- Also happens when using TCA processors, not just itemsProcFunc
- When manually updating column's value in DB, field will not select the value matching DB value
Not tested on 7.6 but I suspect the issue is the same there.