LyX adds unwanted stuff into index entries

[ehud.behar at protonmail.com]

Please consider the attached .lyx file.
The file mainly consists of two index entries inserted via the Insert->Index Entry button in the editor.
It is a MWE for a larger project to be compiled with XeLaTeX. The exported tex commands are not as clean as they could be. Instead of the simple
`\index{Dirac, Paul}`,
I get
`\index{Dirac, Paul@\textenglish[variant=american]{Dirac, Paul}}`
or
`\textenglish[variant=american]{\index{Dirac, Paul}}`
The latter seems to be more correct, but I would like LyX to get those entries cleaner.
Can anyone see the reason for this? Can I change it?

Of course, I can bypass: Create a new custom inset with the following inserted into the layout:

InsetLayout Flex:index

LyXType custom

LabelString "Index"

LatexType Command

LatexName index

Decoration classic

End

But I prefer using the default LyX tools.
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