Windows 10 Microsoft Defender automatically detects rar file as threat

So I was just using the archive app to compress some photos and make an .rar file to send it to my parents. And every time that .rar file is created, the Microsoft Defender kicks in and labels it as severe threat, specifically it says as Trojan:Script/Wacatac.B!ml.

This has never happened before, especially considering none of the compressed photos was detected as threat. Is anyone having the same issue? Is it a bug? Or is my rar app getting compromised and anything it produces is detected as threat? I read online that it could be false positive. But I better be safe than sorry. Currently doing a full scan.

Thank you for your help!