missing glyphs error, missing the char U+000A

[matan]

using lyx 2.4 on Windows 10 Laptop, I write in Hebrew.

the error message I get when compiling some lyx documents is: "Missing
glyphs!" - "Missing character: There is no
(U+000A) in font David/OT:language=dflt;mapping=tex-text;!"

I've tried using the fonts "Ariel" and instead (which according to google
supports this newline character) but I get the same error.
now to the weird stuff, I tried to get a minimal working example but I
couldn't:
I have a document that produces this error when I compile it, I
painstakingly removed parts from it until the error no longer appeared, it
was just after a float figure and a subsubsection* just under it, if I left
it in the file I would get the error, but if I removed it the error would
disappear, so I pasted the figure and the subsubsection* into a new
document with the same preamble and same documents settings but no error!

the funny thing is that I have this error on multiple files and each time
it seems like a different reason but when I try to isolate the problem it
doesn't show up (feels like quantum physics lol).

so far I've had it in this document as I explained, in few other documents
with ERT environments, and some others with just text.

any idea as to how I can solve this problem?

Thanks in advance,
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