Unable to parse BibTeX files where citations use nested `@string`s

Pre-checks*

[x] The issue has not been reported in this repository.
[x] The issue remains after disabling all other extensions and restarting Visual Studio Code.
[x] The FAQ cannot address the issue.
- NB: there's an entry titled Suggestions for BibTeX files are not updated whose link target doesn't exist.
[x] The issue is not related to compiling a document, or the document can be successfully compiled in the OS terminal but not in Visual Studio Code with this extension.

Environment*

Operating System: MacOS 13.5.2
Visual Studio Code Version: 1.82.2
LaTeX Workshop Version: 9.14.0
TeX Distribution Version: TeX Live 2023

The Issue*

The following BibTeX file fails to parse, such that no entries appear in the citation browser / intellisense:

@string{string1 = "Proceedings of the "}
@string{string2 = string1 # "Foo"}

@inproceedings{testbib1,
  author    = {Author},
  title     = {Title},
  booktitle = string1,
  year      = {2023},
}

@inproceedings{testbib2,
  author    = {Author},
  title     = {Title},
  booktitle = string2,
  year      = {2023},
}

If I remove the entry named testbib2 (that uses the string with a nested expansion) then the file parses successfully and testbib1 now appears in the citation browser. Note that it's apparently ok if the nested string is still defined (it's not necessary to remove string2), however if any entry uses a nested string, then none of the entries from the file are usable.

Expected Behavior

Ideally, entries that use such strings would be usable in the citations browser. BibTeX itself has no problem with them.
As a fallback, IMO it would be better to fail the string expansion (e.g. perhaps present the entry with an empty or partial booktitle field) than to reject the entire file.

Logs

Developer Tools Console

Parsing the file as described above:

[11:04:34.225][Extension] onDidSaveTextDocument triggered: file://%WS1%/refs2.bib
[11:04:34.244][Structure][BibTeX] Parse active BibTeX document for AST.
[11:04:34.245][Structure][BibTeX] Parsed 4 AST items.
[11:04:34.306][Cacher][Watcher] "change" emitted on %WS1%/refs2.bib .
[11:04:34.306][Intelli][Citation] Parsing .bib entries from %WS1%/refs2.bib
[11:04:34.307][Intelli][Citation] Parse BibTeX AST from %WS1%/refs2.bib .
[11:04:34.307][Event] FILE_CHANGED: "%WS1%/refs2.bib"

After removing testbib2 and saving the file:

[11:06:11.146][Extension] onDidSaveTextDocument triggered: file://%WS1%/refs2.bib
[11:06:11.243][Cacher][Watcher] "change" emitted on %WS1%/refs2.bib .
[11:06:11.243][Intelli][Citation] Parsing .bib entries from %WS1%/refs2.bib
[11:06:11.243][Intelli][Citation] Parse BibTeX AST from %WS1%/refs2.bib .
[11:06:11.244][Event] FILE_CHANGED: "%WS1%/refs2.bib"
[11:06:11.245][Intelli][Citation] Parsed 1 bib entries from %WS1%/refs2.bib .
[11:06:11.245][Structure][BibTeX] Parse active BibTeX document for AST.
[11:06:11.245][Event] FILE_PARSED: "%WS1%/refs2.bib"
[11:06:11.245][Structure][BibTeX] Parsed 3 AST items.
[11:06:11.246][Structure] Structure force updated with 1 entries for %WS1%/refs2.bib .
[11:06:11.246][Event] STRUCTURE_UPDATED

James-Yu / LaTeX-Workshop