Got it! I'll make sure to publish the fix soon, but for now, make these 3 changes to SuperTextMesh,cs:
Line 2947:
deletedChars += closingIndex-i;
Line 3002:
ParseText_info.rawIndex = i + deletedChars + 1;
Line 3861 - put this if statement in front of it:
if(cutoffPosition <= preParsedText.Length)