AdGuardHome Upstream DNS server handling reverts to load balancing

Prerequisites

[X] I have checked the Wiki and Discussions and found no answer
[X] I have searched other issues and found no duplicates
[X] I want to report a bug and not ask a question or ask for help
[X] I have set up AdGuard Home correctly and configured clients to use it. (Use the Discussions for help with installing and configuring clients.)

Platform (OS and CPU architecture)

Linux, ARM64

Installation

GitHub releases or script from README

Setup

On a router, DHCP is handled by the router

AdGuard Home version

v0.108.0-a.848+9276afd7

Action

Set upstream DNS server handling (with multiple servers configured) to parallel requests.

Expected result

This setting should not change.

Actual result

For some time now, upstream DNS server handling periodically and seemingly randomly reverts to a load balancing configuration, which I believe is the default configuration.

Additional information and/or screenshots

I have searched for this issue in various slightly differently worded variations in several places, but I may just be very bad at it.

This issue presents itself on all instances within my network, but that's probably not terribly surprising as they all have nearly identical configurations.

Feb 26 '24 09:02 saint-lascivious

Same behaviour on my v0.107.44 installation.

Feb 26 '24 17:02 frankrpi3

same behaviour for me on 0.107.44 on openwrt router

please see attached video:

https://imgur.com/a/x9g4eYp

It is also not possible to save the DNS parallel request . It keeps reverting itself to load balancing option

Feb 26 '24 20:02 udtcp

I had thought for a while there that I could trigger it with service restarts, but apparently that was just a string of flukes on my end.

I can however trigger this case reliably as udtcp has shown.

I don't think I'm doing anything particularly exotic with my installations.

Feb 27 '24 07:02 saint-lascivious

You have DOT or HTTPS in the servers?

There is a bug with DOT on this version, to fix temporary i have to choose HTTPS. https://github.com/AdguardTeam/AdGuardHome/issues/6723

Feb 27 '24 08:02 MichaelAndoid

Not personally, no. All my upstreams are local Do53.

Feb 28 '24 00:02 saint-lascivious

You have DOT or HTTPS in the servers?

There is a bug with DOT on this version, to fix temporary i have to choose HTTPS. #6723

I have just one https upstream, and few regular DNS for my domain, and it still does that

Feb 29 '24 10:02 spitfire

I just tried and it resets if you save any of the settings below Upstream-DNS in the DNS-settings. Changes to Upstream-DNS and the other settings don't seem to affect this.