[Paul O’neill]

Only just came across this issue myself, so sorry for being late to the party. May help future readers:

The restriction seems to relate to word length: I wanted to create a binary string to over-fill a 1080 comp. and had the same disappearing text issue. Placing a [space] at the end of each line of text, followed by [shift+return] for a soft-carriage return enables you to fill a paragraph block of a size of your choice. The space at the end of each line shouldn’t affect the look of the layer or comp.

Cheers,

Paul