there is a way to workaround it, use partprobe
it is the original solution:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=824553
** Bug watch added: Debian Bug tracker #824553
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=824553
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https://bugs.launchpad.net/bugs/1743026
Title:
qemu-nbd -c /dev/nbd0 fails to map partitions
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