I got a new anti-malware platform update on 1809(probably on other versions too): KB4052623 (Version 4.18.1908.7) If anyone installed it and can help please run sfc and dism scanhealth to see if it's going to break windows components or not
if you mean the powershell defender errors, they occured on every windows 10 version since 1607 (not sure about 1507). -andy-
Don't be so sure. If this is to address a live exploit you may not even need to be using IE to become compromised. If MS is breaking its own rules to release a security fix it is likely an important update.