BUG: E-Mail Protection with Sandstorm gives me a "Malware (antivirus engine)" Error

So i been testing Sandstorm and sending myself clean .exe files to my Sophos 9.4 Beta. With active Sandstorm i get the following error upon releasing an E-Mail containing a .exe file.

on the SMTP Log it says

sandstorm statistic:

this behaviour is reproduceable