Can't Add a certain website to Web Shield

[sck]

I keep repeatedly getting a Avast WebShield alert for a block on...
URL:Mal on http://contagiodump.blogspot.com/feeds/posts/default

Yet, I have in Exceptions for WebShield

• http://contagiodump.blogspot.com/feeds/posts/default
• https://contagiodump.blogspot.com/feeds/posts/default

I'm running Avast Security (14.4) on MacOS Catalina 10.15.5

The issue is that this feed is part of my NetNewsWire RSS list, so I will get a pop-up which takes over input focus when it happens, and thus whatever I'm typing suddenly disa.......

So, it's rather annoying. How can I make sure that this URL is not blocked further. Have tried excluding the domain, but that didn't work either.

[Asyn]

You can report a suspected FP (File/Website) here: https://www.avast.com/false-positive-file-form.php