RouterOS blatantly ignores pref-src. Can this really be a bug?

[Mimiko]

If you meet the criteria that I’ve explained in the previous post about “main” routes and addresses not being lost, sindy’s version works absolutely fine with leaving the source address in place. Of course only if correctly implemented

Public addresses are static, but providers may disconnect of some power outage or any other problem and reconnect back. Mostly it is constant.
I do not find any of Sindy’s post related to this problem. Could you pinpoint it?