Text messages being converted to multimedia message when using BrailleBack and typing on braille display keyboard

Has anyone else been experiencing text messages being converted to multimedia message (without wanting this to happen), when typing a message via Braille display keyboard? I'm gathering this is yet another unaddressed issue/bug with BrailleBack, and it appears to happen when I've been typing faster and I suspect also when a grave accent has occurred as a typing error, but beyond that, I'm still unable to isolate why/how this is happening, especially as there is no equivalent item in the message menu of my phone (the SmartVision2 made by Kapsys). I had turned to BRLTTY and was trying that for a while as an alternative, only to find I was still getting unreliable/buggy feedback when typing messages - especially as soon as editing was involved!