libcap version 2.50-1 is missing the file /usr/bin/capsh due to a regression upstream.
I contacted the Arch maintainer, he pushed out a new release 2.50-2 that contains the missing file. As of today, it’s in their Testing repo. [1]
If you need capsh before it hits the Manjaro repos, the source is available at [2].
[1] Arch Linux - libcap 2.50-2 (x86_64)
[2] https://git.kernel.org/pub/scm/libs/libcap/libcap.git/snapshot/libcap-2.50.tar.gz