In your simple example, does it still work if you replace the ODS text with:
P 'הפאנל מתעדכן בכל יום ומהווה טבלה צוברת של העמדות החל מ01.09.2020 ועד יום עסקים אחרון'/Style=Header {fontsize=12pt color=black fontstyle=italic fontweight=bold just=R };
?
It's great that you have an example that works, and an example that doesn't work.
Typically I would start with the example that doesn't work, cut it down to be much simpler (just one or two lines in the email). And see if it works. Then I would make that example even simpler, in iterative steps, to see if it starts working. So you could remove the style format, then remove the non-Latin characters, etc. The hope is that as you make your non-working example more and more like the working example, you'll find the issue.
Or alternatively, you can take your working example, and add complexity to it, to see if it will break.
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