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Some kind of simple logo was reported to be mis-imported in the RTF filter, it looked like this:
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which is interesting, but the reference output is different:
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With a bit of investigation, it turns out this was a flipped group shape with a few rectangles, so the mis-rendering of the logo was due to two independent problems. The first is that the child shapes inside a group shape were scaled incorrectly. See the commit for the exact details, after fixing scaling, it looked closer to the original:

The second problem was that the group itself was flipped, and this was again ignored on import. After fixing that problem:

the result is basically the same as the reference. Both fixes are not only on master (towards LibreOffice 5.3) but also backported to LibreOffice 5.2. :-)