Created attachment 143703 [details]
Wrong font for Hebrew text in RTF: minimal reproducer
In the attachment, the only defined font in the RTF is Times New Roman. It is applied to all the text in the document, and Word shows all the text (both Russian and Hebrew) using TNR. But when opened in LibreOffice, the Hebrew font is shown using the font defined in Options→LibreOffice Writer→Basic Fonts (CTL). Replacing \f1 in \pard with \loch\f1\hich\af1 fixes the problem, so apparently LibreOffice does not treat \fN as setting font for all language variants, just for Western languages, despite "Associated Character Properties" chapter in  tells:
> Although RTF defines a broad variety of associated character properties,
> any implementation may choose not to implement a particular associated
> character property and share the property between the Latin and Arabic
which implies that associated character properties are optional, and in the absence of those, standard properties (like \fN) should be used for all language variants.
Tested with Version: 184.108.40.206 (x64)
Build ID: b3972dcf1284967612d5ee04fea9d15bcf0cc106
CPU threads: 4; OS: Windows 10.0; UI render: default;
Locale: ru-RU (ru_RU); Calc: CL
Said to be OK in OOo and AOO; suspect regression.
 Rich Text Format (RTF) Specification Version 1.9.1 https://www.microsoft.com/en-us/download/details.aspx?id=10725
Created attachment 143709 [details]
comparison MSO 2010 and LibreOffice 6.2
Version 220.127.116.11.alpha0+ (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)
but not in
*** Bug 118896 has been marked as a duplicate of this bug. ***
the font was Times New Roman, then in
Build ID: d6cde02
it was to Sans, and later, in this range of commits ( https://cgit.freedesktop.org/libreoffice/core/log/?qt=range&q=e19f1afb2c253944968f85b963934a60b87f472a..3cf91a21fc5089fb7f051bf8a04d2049da88179f ), it changed to Lohit Devanagari
Dear Mike Kaganski,
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Still repro with Version: 18.104.22.168 (x64)
Build ID: c75130c129d9c5e43b76e4f26881b3db8bdb5c91
CPU threads: 12; OS: Windows 10.0; UI render: GL; VCL: win;
Locale: en-US (ru_RU); UI-Language: en-US