enrol_meta user_enrolments status should be synchronized if a parent course's enrolment visibility changes

I found an unexpected behaviour (undesired IMO) I've noticed that, setting an enrol_meta to a parent course which contains enrol_manual users and this enrol_manual instance is disabled, user_enrolments in the child course are created as suspended. This make sense.

But when the parent course enrol_manual's instance is enabled, user_enrolments are not synchronized and they remain suspended, although once I edit any of the child course user_enrolment's (changing any value, not just submitting the form) the user_enrolment is not suspended any more.

I've experienced this in 2.9 dev, but I suspect it was designed like this so all maintained versions should be affected.