Question about convert to editable text

So sometimes when i hit convert to editable text on a PSD layer, it makes a copy and mutes the original, sometimes it just straight up converts it and i lose the original layer (of course it's still in the project folder). What is the rule for when this happens? I want to say it has something to do with whether the layers are nulled or not based on my observations, but i just wanted to know so i could be consistent with it in the future.

Thanks !