sublime-completions problems with word buffer

I have a long sublime-completions file (about 2000 lines). The completions work fine, but words from the current file simply get ignored.

At first I thought the problem was about having characters like ( , : etc in the trigger, but it turns out it's a combination of characters + long file. Everything works great with a shorter file, but for a long file it only works if the trigger only has short words with nothing but letters.

I need to put those characters in the trigger so I can see which method I'll be "triggering". It is not possible AFAIK to put a description in a completions file, the way you can in a snippet.