"There were undefined references" warning on every second TeX run

[moewew]

The following MWE

\documentclass{article}
\usepackage[backend=biber]{biblatex}
\addbibresource{biblatex-examples.bib}

\begin{document}
\cite{sigfridsson}
\printbibliography
\end{document} 

Produces a

LaTeX Warning: There were undefined references.
Package biblatex Warning: Please rerun LaTeX.

warning block every second LaTeX run after the successfully Biber run.

I can consistently reproduce the following sequence of results with the up-to-date dev versions of both biblatex and Biber.

1. pdfLaTeX: "Citation sigfridsson undefined"
2. Biber
3. pdfLaTeX: "there were undefined references"
4. pdfLaTeX: no warnings
5. pdfLaTeX: "there were undefined references"

etc. etc.

biblatex 3.3 and Biber 2.4 work just fine in that they produce no warnings from step 3 onwards.

A short look at the .aux file shows that it only contains the line

\abx@aux@defaultrefcontext{0}{sigfridsson}{nty/global/}

on every second run.

[plk]

Fixed.

[moewew]

I can confirm that the problem does not resurface with the brand-new dev version from sourceforge.

Thank you for the quick fix.