What testing? Since I play with Asuswrt every single release has something fixed and something broken. It's a perpetual beta cycle firmware. If the feature is something selling routers (like AiMesh) - you may get better chances for a fix. If it's something more hidden (like Dual WAN) - forget about it. One of the versions had firewall bug recently exposing your devices on Internet when specific settings are selected and IPv6 is enabled. Traditional QoS and Bandwidth Limiter are broken in 388_22525 with IPv6 enabled as well. There are multiple GUI bugs no one cares about.
Here is one:
View attachment 49765
DDNS not working in double NAT? External detection method was implemented in Asuswrt long time ago. It is working. The message is there because it was there before and no one removed it. It's like that for like 3x firmware versions already.
This broken slider is from first 388 release, never fixed:
View attachment 49766