I think this is either a bug or an undocumented limitation. In my game, I list everyone in the credits that has contributed financially by donating one way or another on my Twitch stream. Surprisingly, this has created a rather large list to include in the credits. I store the names in a lua module because I call them both on the main menu and in the ending.
I just noticed that the names get cut off at a certain point (they are all placed in one single gui text node). I manually pasted the names into a node in the editor to verify, and got the same behaviour.
I can split this into multiple text nodes no doubt, but thought I’d report it anyway.