Open cmp.complete() after snippet expansion

[avonmoll]

First, I'm not sure if this is best suited for this module or the ultisnips module I am using.

Expected Behavior
When a snippet expands into some text that would normally trigger the completion window to open, the completion window should open.

Example
I am mainly working with tex documents. I have a snippet which automatically triggers when I type cite which expands to ~\cite{|} with the cursor marked with the pipe character. Without the snippet, if I type ~\cite{ the completion window appears with citation entries populated by the associated bibtex file (note: I am using the configuration from here).

This is how it has worked for me in the past when I used, e.g., deoplete.