Canary: some requests bypass the system proxy (Stable works fine), causing long "connection problem" on startup and broken media

On the Canary build, some network traffic does not go through the system proxy, while the Stable build respects it correctly on the same machine and network. I'm in a region behind the GFW, where a proxy is required to reach Fluxer's servers and media/CDN hosts. As a result, when launching Canary, the app shows the "Having trouble connecting?" banner for a long time and stays in the loading state. Once the connection finally succeeds, many media items (images, avatars, emoji, attachments, etc.) still fail to display. Stable works normally under the exact same proxy setup. I'm not sure whether this is a bug or an intentional change (e.g. for security reasons). If it's intentional, sorry about that. In that case, I'd appreciate knowing whether there's a setting or workaround for users who rely on a system proxy.

1.Configure a system-wide proxy (Windows system proxy settings; no TUN/transparent proxy mode). 2.Launch Fluxer Stable: it connects normally, and messages and media load. 3.Launch Fluxer Canary under the same conditions.