IPv6 filtering breaks Google Maps background tiles (Samsung Find, etc.)

[Samuel12321]

Please answer the following questions for yourself before submitting an issue

• Filters were updated before reproducing an issue
• I checked the knowledge base and found no answer
• I checked to make sure that this issue has not already been filed

AdGuard version

v4.12.2 (4.12.80)

Environment

• OS version: Android 16 One UI 8
• Device: Samsung Galaxy S25

HTTPS filtering

• yes, I do

Root access

• yes, I have it

Integration with AdGuard VPN

• yes, I do

Routing mode

Local VPN

Ad Blocking

AdGuard Base filter, AdGuard Mobile Ads filter

Privacy

No response

Social

No response

Annoyances

No response

Security

No response

Language-specific

No response

Other

No response

Which DNS server do you use?

DNS protection disabled

DNS protocol

None

Custom DNS

No response

What Stealth Mode options do you have enabled?

No response

Issue Details

Steps to reproduce:

1. Enable AdGuard for Android (VPN Mode).
2. Ensure IPv6 filtering is enabled (Default state).
3. Open an app that uses the Google Maps SDK for background tiles (e.g., Samsung Find, SmartThings Find).
4. Observe the map area is blank/grey (overlays still appear).

Expected Behavior

Map background works

The app should either load tiles via IPv6 or fallback to IPv4 immediately if the tunnel negotiation fails.

Actual Behavior

Map remains blank

The connection to map tile servers (*.ggpht.com, mapsmobilesdks-pa.googleapis.com) hangs or fails when routed through the AdGuard IPv6 tunnel. It does not fallback to IPv4 gracefully, resulting in a permanent blank map.

Screenshots

Screenshot 1

Additional Information

No response

[Samuel12321]

[Samuel12321]

Reported through app as well 77KG6E-NR76E

[ESurina]

In order to troubleshoot this issue, we need to get your application logs.

Here's what we need you to do:

1. Enable debug logging:
   Settings -> General -> Advanced -> Logging level -> Debug.
2. Reproduce the problem, then remember the exact time when it happened.
3. Collect logs:
   Settings -> General -> Advanced -> Export logs and system info.
4. Send this file to qa@adguard.com:
   • include [android] keyword and 5964 in the subject of your email
   • specify the exact time when the issue occurred

[ESurina]

@Samuel12321 I remind you to send us your logs.

[ESurina]

Please reopen the issue when you have a chance to send us the logs.