"Copy a parsed text to a field" from Parent field to Child field, does not seem to work upon transitions

[ITSAM]

"Copy a parsed text to a field" from Parent field to Child field, does not seem to work upon transitions

We are trying to copy the out-of-box Priority field from the Epic down to the child Story upon story creation or when we move the Story to Done. The Priority ends up being whatever was chosen on the child.

[Fidel Castro Armario]

In order to set fields in child issues (e.g., Story) from Epic issue, you should use "Write field on linked issues or subtasks" post-function in Epic's workflow selecting issue link type "is Epic of".