Blank message in RT only when email arrives with encode base 64

Hello iam running RT 4.4.1 on debian 9.3.

I got a problem when email arrives with base 64 encoding it doesnt show TEXT in ticket details (picture below) however it shows logos attached to it. I can see only plain text if i open it seperatly on right side with (Download, or with headers).

Anyone can guide me where problem could be?