There’s a list of known bugs here:List of Current Bugs
This issue relates to Bug No 19. The Bug list was last updated January 23rd but some bugs are present in .8012 and not in the current Beta.
The devs are working through this list ahead of the third Beta due to come out at some point soon. There appears to be less staff these days working through them as they prioritized their Xcitium Business solutions some time back but they are working through them.
I only have the sable version installed on my PC as I only production machine but I have tested out the Beta 2 a couple of times. Development has been slow and the 3rd Beta already a couple of months behind schedule so you will probably have to find a related solution such as via Windows Firewall which runs along side CF, a browser extension or you might be able to do it old school via the Hosts File. There’s also the option of Web Extensions like SiteBlock or uBlock Origin but you can even do the same via some DNS providers.