This seems to be fixed since at least focal.
dropbear (2018.76-3) unstable; urgency=medium
* debian/initramfs/bottom-dropbear:
+ Read and parse /proc/*/stat instead of ps(1)'s output, as ps(1) options
differ between Debian and Ubunt's busybox. Thanks to 'eviljoel' for the
patch. (LP: #1652091.)
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https://bugs.launchpad.net/bugs/1804508
Title:
dropbear-initramfs init-bottom script uses wrong ps options, can't
kill descendants
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