Ranked is routing me to ap-east-1 despite having ~60ms to ap-southeast-2

I'm located in Australia and have recently started having a strange server routing issue in Apex Legends.

Normally I get around 60ms to both:

ap-southeast-1

ap-southeast-2

Recently, however, my data centre ping has changed:

ap-southeast-2: ~60ms

ap-southeast-1: ~200ms

The bigger issue is that Ranked matchmaking is putting me into ap-east-1 (East Asia) servers, despite manually selecting an appropriate SEA/OCE data centre.

What's especially confusing is that ap-southeast-2 is still showing ~60ms, so I clearly still have a normal low-latency route to the region. My general internet connection also appears completely normal.

This seems like it could be an issue with Apex's data centre routing, Ranked matchmaking, or routing/peering between Australian ISPs and EA's servers.

Has anyone else in Australia been experiencing this recently? Is there a known issue with SEA/OCE routing or Ranked matchmaking?

This has been occuring for about a week now and makes Ranked basically unplayable.

Any help is appreciated.