Issue Summary

There's an existing action in Automation that allows setting entity properties:

But it's not possible to delete the entity properties using this action. You can just set the property to NULL, but it will keep existing.

Expected Results

The ability to delete entity properties using automation rule actions.

Actual Results

It's possible only to create and update entity properties, but the delete action doesn't exist.

Workaround

Use a send web request Delete action to the endpoint "https://your-domain.atlassian.net/rest/api/3/issue/{issueIdOrKey}/properties/{propertyKey}".
API details here.