False positive: correct quotes marked as missing termination

## Description

I occasionally stumbled upon this; not exactly sure when this issue occurs. But one case is when there are three consecutive quotes.

## Resources

sample text

```md
Foo "bar." Hello "World" goes. Third quote: "Clears custom."
```

Start by reproducing the false positive with the supplied Markdown sample, then investigate how the three-consecutive-quotes case produces the missing-termination diagnostic. Done means the valid quoted text no longer receives that diagnostic, with the reported case covered by a regression check.

Written by the indexing model from the issue text.