Document Setting "Synchronize with output" doesn't work

[ehud.behar at protonmail.com]

I tick the check-mark for "Synchronize with output" in Document Settings->Formats for my document, but no synctex.gz file is generated.

The problem is on LyX 2.3.6.2, on macOS 12.1, and the line of code \synctex=-1 disappears from the preamble in code preview pane only when I tick a check mark on "Use Non Tex Fonts" setting. When I uncheck the check mark this line of code re appears.

Why is it?
Maybe there is a clash with some other option or setting that I changed in LyX's Preferences?
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