It seems memory limits changed for iOS 15, at least for tunnel providers it seems to be 50 MB now. Can you confirm this @eskimo?

From @rfan1560's comment: I received a response to my feedback (FB9605687). Apple Response: Investigation complete - Works as currently designed Please know that our engineering team has determined that this issue behaves as intended based on the information provided. Ppecifying the user-agent is a "should", not a "must". So @eskimo, is this now considered "by design" then? There's no chance that this will change in future versions of iOS?

Quick update: Still an issue in both 15.0.1 and 15.1 Beta 2.

Still the same behavior on iOS 15 GM, any chance this gets fixed on 15.1 @eskimo?

Still the same behavior for iOS 15 beta 8.

Just to keep this thread up to date: This behavior is still present on iOS 15 beta 6.