I have two sites both served using Cloudflare Workers. Site A is served from a nearby edge as expected, but site B is routed to all kinds of other places. Since site A is working fine and I reproduced the issue in three locations, I don’t think this is an ISP issue on my end.
My house Internet in Tokyo: SJC
My phone: ICN
Server on GCP in Tokyo: SYD
Site A goes to KIX from all three places.