Permanent failure: mailbox_disabled is incorrectly processed as Soft Bounce.

[Alpha1]

I have about 1k email bounces with the following bounce message after a member replied to an old mega thread:

Diagnostic-Code: smtp; 554 30 Sorry, your message to [email protected] cannot be delivered. This mailbox is disabled (554.30).
Status: 5.3.0
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These are incorrectly classified as soft bounces, while these should be hard bounces.

This specifically pertains to Yahoo and AOL related email providers, as well as an array of smaller ones.
These addresses make up a significant...

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