In Ansi Terminal, the $ ending works inconsistantly. Sometimes causing errors.

[eightbitswide]

The documentation indicates that the FabGL Specific Terminal Sequences use a closing $ at the end of the line.
Example: Terminal.write("\e_GPEN255;255;0$");

Calling these from CP/M using MBASIC I've noticed that most of the time the $ is ignored causing it to be displayed on the screen.
Eliminating them from the line endings seems to be a cure, but I'm not sure if I'm breaking functionality if I share code with other users.

Here's an example of a MBASIC-80 program which seems to demonstrate the issue:
https://github.com/eightbitswide/ppmview/blob/main/PPMVIEW.BAS

Can someone share their experience with this or shed a little light here?

Thanks
-8b