[vim/vim] NFA engine creates impossible groups (Issue #20802)

[Mukundan]

Mukundan314 created an issue (vim/vim#20802)

Steps to reproduce

1. Open a file with the contents:

testing
testing

2. Execute the command %s/\v(.)@<=/ |\1|/g
3. Notice that the second line contains a ||e while implies \1 was empty

Expected behaviour

Contents after the substitute should be:

t |t|e |e|s |s|t |t|i |i|n |n|g
t |t|e |e|s |s|t |t|i |i|n |n|g

(which is also the result when executing with the old engine)

Version of Vim

9.2 1-804

Environment

OS: Arch LInux

Logs and stack traces

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