Provide an option to disable fallback

[lessload]

Issue Details

• AdGuard version:
  • v3.4.120
• Filtering mode:
  • Local VPN, DNSCrypt (Adguard)
• Device:
  • Mi CC9 Pro (Xiaomi)
• Operating system and version:
  • Android 10
• Root access:
  • No

Expected Behavior

App should always filtering traffic or have something like Kill Switch. and stop only when disable protection.

Actual Behavior

After update to v3.4. I found dns traffic leak to my pi-hole randomly but too many dns leak. Adguard show as protection enable but traffic still leak need to re-enable to fix it. i always active Adguard, and enable Always-on VPN function in android setting. The traffic that leak not show in Filtering log. Please check.

Additional Information

[already set battery - No restrictions / enabled - auto start] but when update blocklist it couldn't leak the traffic. it shoult have something like kill switch to protect the traffic.
Adguard not work with multi-user android? (dual-app on MIUI)

[lessload]

Long time test nothing can fix. not sure the problem was from. now go back to 3.3.3. Not found such a problem.

[ameshkov]

@lessload is there any change when you select DNS-over-HTTPS traffic?

[lessload]

@lessload is there any change when you select DNS-over-HTTPS traffic?

it's still leak. it may MIUI campatibility problem.

[the4anoni]

I've got dns leaks too.
Galaxy S10 OneUI 2.1

Leak was from mobilewips app com.samsung.android.server.wifi.mobilewips.client

[the4anoni]

@lessload is there any change when you select DNS-over-HTTPS traffic?

I used Opendns DoH in adguard