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An `EVENT_BASED` workflow with a property-change trigger that also sends `listMembershipFilterBranches` is accepted, but the filters are silently dropped: a GET returns `listMembershipFilterBranches: []`. Measured on a custom-object workflow.

Measured

Checked

Checked October 16, 2026 on a HubSpot developer test account

Area

Tags

workflows, triggers, filters, property-change, enrollment

More facts from this area

In the Automation v4 spec, an AB_TEST_BRANCH action routes each path through testBranches[].connection.Source pending
The workflow action-type catalog (GET /automation/2026-09-beta/action-types) carries each type's actionTypeId, name, group and input names only. It has no field that says an action is Breeze, uses AI, or consumes credits, so credit-using actions can only be recognized from a curated list of ids.Measured
The action-type catalog GET /automation/2026-09-beta/action-types doesn't list the classic actions 0-3 (task), 0-8 (internal email) or 0-11 (rotate owner), though flows using them save and run.Measured
Add to static list is workflow action 0-63809083 at version 5, with fields: { listId, targetObject: "{{ enrolled_object }}" }.Source pending
A multi-checkbox "add to existing values" edit (0-5) is value: { type: APPEND_OBJECT_PROPERTY, appendPropertyName }, and it works together with association. A guessed fields.appendValue is silently dropped.Measured

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