Tabstops are lost when snippet trigger is beginning of parent snippet

[oiiiiiiii]

Here is a minimal example to replicate the issue:

return {
	s("abc", fmt('a{} = "some {} string {}"', { i(1), i(2), i(3) })),
	s({
		trig = "(\\w)tri",
		trigEngine = "ecma",
	}, {
		t("a_"),
	}),
}

First I trigger the abc-snippet. Then I type "tri" for the second snippet and expand that one (either manually or set or by making it an autosnippet). Because "a" is part of the trigger (and the beginning of the parent snippet abc) the tabstops are lost and I can no longer jump into the string. When I replace

a{} = "some {} string {}"

with

local a{} = "some {} string {}"

it works, as now the beginning is not part of the trigger of the second snippet. I know the example seems useless but I have some real usecase (which is not as simple) that would require that to work.

[L3MON4D3]

Mhmm LuaSnip in general tries its best to remove/skip partially deleted snippets, even if it's only such a small part.
I think the reason you observe this issue only without the "local" is simply that (at the moment) only fully deleted nodes trigger this deletion (which occurs in the first case, where the entire "a"-textNode is deleted, but not in the second, where the "local " remains).

What are you trying to accomplish?

[oiiiiiiii]

Hm, ok. My usecase is more or less this (I just made it a bit simpler and just one example):

return {
	s("fun", { i(1, "f"), t(": "), i(2, "\\mathbb{R}"), t(" \\to "), i(3, "\\mathbb{R}") }),
	s({ trig = "(\\w)hat", trigEngine = "ecma", snippetType = "autosnippet" }, l("\\hat{" .. l.CAPTURE1 .. "}")),
}

This is a snippet for LaTeX. When I first trigger the "fun" snippet I get

f: \mathbb{R} \to \mathbb{R}

Whith the first insertNode containing f being selected. Then I type "fhat" because I want to have f with a hat as function name, but now all tabstops are lost.

[oiiiiiiii]

Do you have an idea where the issue might be that causes that? I would put some work into finding the problem myself too, but I have absolutely no clue where to start.