MusicXML export doesn't include tempo markings?

I’m doing some tests, exporting my score from Dorico as MusicXML. I’m finding that none of my tempo markings are being included in the MusicXML export. (This can be verified by exporting as MusicXML then immediately re-importing into Dorico, so as to eliminate the possible cause of a different program.)

Is this correct? Is there some way to get tempo markings to export? (Am I doing something wrong?)

My tempo marks are exported without problem.
Have a look in the xml file for the metronome tag