\oiint symbol does not show up in LyX

[Nusret BALCI]

Hi there,
Typing \oint (note the single "i") in math mode shows the relevant  symbol
on screen, but the symbol for double integral version \oiint (note the
double "ii") is not shown in lyx editor: instead a tiny space character (I
assume) is shown. The resulting pdf is fine. What might be the cause?
LyX 2.3.4 (same for 2.3.3), macOS mojave
Regards,

Nusret
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