Sometimes Export forgets an artboard's file name.

I batch export A LOT of assets in xd. It normally works really well.
I diligently label each artboard to that the exported filenames are easy to sort through.
Occasionally, the export will just disregard the artboard name and use a default file name "asset-1.jpg", "asset-2.jpg", etc.

See attached screenshots listing the artboard names vs the artboard exports.