Steps to reproduce:

1. Load Inkplate2_Peripheral_Mode from InkplateLibrary examples
2. clear display, add hello world text and display framebuffer via serial, eg.:

   #K(1)*
   #C("48454c4c4f20574f524c44")*
   #L(1)*
   

3. Observer blank white screen after refresh

Workaround: Add text color command, e.g.:

            case 'H':
                // Set text and background color
                sscanf(s + 3, "%d,%d", &foreGroundColor, &backGroundColor);
                display.setTextColor(foreGroundColor, backGroundColor);
                break;

Then:

1. clear display, set text color, add hello world text and display framebuffer via serial, eg.:

   #K(1)*
   #H(2,0)*
   #C("48454c4c4f20574f524c44")*
   #L(1)*
   

2. Observe red 'HELLO WORLD' text on white background after refresh

Also the documentation lacks the setTextColor method: