Incorrect Radical/Square Root containing Fractions about firamath HOT 7 OPEN

Where is the sense of defining mathversion=sans? Fira is by default sans serif.

\documentclass{article}
\usepackage{unicode-math}
\setsansfont{Fira Sans}
\renewcommand\familydefault{\sfdefault}
\setmathfont{Fira Math}

\begin{document}

	inline math: $\sqrt{a}$ $\sqrt{\frac{a}{b}}$.
	
	display math:
	\begin{displaymath}
		\sqrt{a}\sqrt{\frac{a}{b}}
	\end{displaymath}

\end{document}

from firamath.

Where is the sense of defining mathversion=sans? Fira is by default sans serif.

\documentclass{article}
\usepackage{unicode-math}
\setsansfont{Fira Sans}
\renewcommand\familydefault{\sfdefault}
\setmathfont{Fira Math}

\begin{document}

	inline math: $\sqrt{a}$ $\sqrt{\frac{a}{b}}$.
	
	display math:
	\begin{displaymath}
		\sqrt{a}\sqrt{\frac{a}{b}}
	\end{displaymath}

\end{document}

I don't know what OP's reasons are here for mathversion=sans, but I can imagine where two or more math fonts are used in a document. For example, serif math for normal text and sans serif in titles and section headers, or in figures.

from firamath.

Yes, mathversion=sans is a reminiscence of a larger file where I defined other math fonts in version 'sansbold' and 'bold'.
But again, following Herbert's suggestion and removing the definition of mathversion, the problem still exists.

For clearness: I do not use the font FiraMath-Regular.otf from Tex Live or the official GitHub source, but use the fonts built from source. Unfortunately, these built fonts show the behavior, and I do not understand the source so well to solve the problem on my own in changing the source code... 

from firamath.

can you provide your math font file for download?

from firamath.

This is the file I get after following the building rules (without the patch):
FiraMath-Regular.zip

from firamath.

For the symbols at the end of the file it looks completely different to the current FiraMath-Regular.otf from TL2023
It looks like a problem with the tools, but I am not sure.

from firamath.

I downloaded the source and created the fonts. Only FiraMath-Ultra.otf has no problem with the square root

from firamath.