First, I’m an Avast user and not an Avast Team member.
You won’t get a direct response but it should be analysed within 48 hours, if found to be false it will be removed. So it must presumably still be considered a good detection.
There are sites that can also check a site link.
https://www.virustotal.com/ - 90 different scanning engines, so this would give a good idea of the site state 0/90 currently.
Your image indicates the check was done on a sub(.)domain app2 and that final url is connecting off site. So I don’t know if that is also the case with the Avast detection as you haven’t posted a screenshot of the alert (as in this instance).
As I mentioned I will try and draw some Avast Team input into this matter - which I have.
Thank you for reporting this. I reviewed the reported URLs but was unable to reproduce the Avast detection at this time.
If you are still seeing the detection, could you please share a screenshot of the alert along with the Detection ID? This will help us investigate the issue further.