On 03 Apr 2020 at 11:14p, Black Panther pondered and said...

This was uploaded into the message editor in Mystic. Within the editor,
it was cutting a character from the end of each line...

Yep saw the same here from your original post. Thanks for doing these tests.

--- Mystic BBS v1.12 A46 2020/03/29 (Windows/32)
* Origin: Agency BBS | Dunedin, New Zealand | agency.bbs.nz (21:1/101)