Android application traffic bypasses VPN connection

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I'm currently building an app using react-native. The app will be used for watching live video streams, and it'll be possible to join the live stream (RTSP link) via a specific IP address (provided by VPN). In iOS, the connection is established without a problem, and I can watch the live stream. As for Android, it's not possible to watch the live stream. It seems to me that the application traffic bypasses the VPN connection. I can only watch the live stream in Android (with the VPN connection being enabled) if I minimize the app and use the VLC player.
Can you please help me understand if there's any issue on Android's side? Which one?

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https://wiki.strongswan.org/issues/3224