The last character of a wrapped line can be missing

[Montandalar]

If you type a long line, there is a form of automatic line wrapping applied. However, this can remove the last character of the line entirely instead of moving it to the next line. See for example these tutorial signs I wrote about using Multidecor's Paint Brush - compare the infotext with the rendered texture:

[Montandalar]

The text of the signs for easy pasting is:

If the paintbrush is on the end of your hotbar, it will use the inventory slot after the hotbar's end (the slots are numbered from left to right, top to bottom)

You can only colour a fresh item once.

Some colours like Dark Green Dye are not supported.