Asa, I'm impressed that you got iPlayer to rewind, I've tried two different browsers and can't get it to switch region at the moment!
In the past, when a nation has had problems, the other two nations have stepped in to help. So I guess BBC One Wales is either a bespoke service coming from the spare continuity suite in Belfast or simulcasting BBC One NI, and BBC Two Scotland is coming from BBC Scotland's spare suite or simulcasting BBC Two NI. Although that would be strange as BBC Two Scotland no longer exists.
I'm seeing quite a bit of picture breakup on BBC Two Wales DSAT so they might be rerouting it.
Worth keeping an eye on S4C to see what happens for Newyddion at 7.30.
Write that down in your copybook now.