Bug: Base64 Text Measures break down when having Calculation Groups

[mmqqq19999]

Hi all. I have a few concatenate measures to bypass the 32000-character limit in Power BI - They all work fine until I add a calculation group and calculation item - they all break down then. You don't even have to use it - the mere existence of a calculation item is enough to break them. I cannot find much info on the web about this very niche issue. Hopefully, someone has an answer/explanation. 

Cheers,

Quang