There might actually be a bug in that case, as this isn’t the first time hearing something working in regional vs global.
It’s also been observed seeing peoples apps regionally connecting with as much as 64.4% (per one user who launched their companies dispatch app) more easily with nearest regional cluster vs global deployments as well.
This has been observed since global was released, and is viewable in previous ticket histories too for the TS department.
Potentially it could be the match expression, but ultimately having something work like this in regional vs global is a fairly consistent phenomenon that’s been seen on more than one occasion.