Sean Gallardy explains an issue:
Let me start off by saying that DBATools is a great tool that is immensely helpful to the community, if you haven’t heard about it or tried it, please give it a shot! I personally believe that the SQL Server community is truly the best out there, with so many people helping each other and developing great, free, tools that benefit all. Having said that, I’ve been asked quite a few times to look into a “SQL Server Bug” decrypting data.
This is not an issue with SQL Server nor is it a bug/feature/whatever. It is, in fact, a bug in the source material for DBATools.
Read the whole thing.