Snippet "..." is triggered automatically on first period

Question

I have this snippet (from Gilles Castel's famous snippet list), which I use with coc-snippets.

snippet ... "ldots" iA
\ldots
endsnippet

However, in Neovim (0.5.0 Win10) this snippet automatically expands whenever I type a period. I would have expected the automatic expansion to be triggered only when I type three periods in a row. At first I thought Vim's repeat command had something to do with this, but I'm in insert mode so that cannot be it.

Not sure whether this is relevant but I noticed that there is another (default) tex snippet in snipmate format that looks like this:

snippet . dot product
\\cdot {$0}

Yet this snippet works fine, i.e. it only expands when I hit tab after typing a period since it does not have the iA option attached to it.