This is a follow up of Bug 168572. If you open the test .odt file provided on that report with a recent development version of LibreOffice 26.2 and export it to Markdown, you'll see that the Math object included in the original document gets replaced by 

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completely erasing the object content. 

The export filter should, at least, provide the Math instructions, which in the case of the test file are

int from a to b cos ( x ) dx = sin( x ) + C

Some marker to indicate the beginning and end of the object would be great, too.

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NOTE: 

Ideally, because many Markdown editors (for example, Markor) understand LaTeX syntax, translating that expression as

$\int_{a}^{b}\cos\left(x\right)dx=\sin\left(x\right)+C$

would be great.