I've got issues with bzip2 when using symbolic and hard links (quite useful for Yocto generated images).
I'm using Linux Mint 19.3 and bzip2 version 1.0.6 (6-sept-2010). I know the latest release is 1.0.8 but I could not find any related info in git log history.
# I have a bz2 file and soft and hard links to it.
$ ln -s my_file.bz2 my_softlink
$ ln my_file.bz2 my_hardlink
# Then I try to uncompress it through the symbolic link
$ bzip2 -d my_softlink
bzip2: Input file my_softlink is not a normal file.
# Now I try to uncompress it using the hard link
$ bzip2 -d my_hardlink
bzip2: Can't guess original name for my_hardlink -- using my_hardlink.out
bzip2: Input file my_hardlink has 1 other link.
For the 2 cases, using the -k option does not help.
For soft links, it would be nice to allow to follow the symlink with another option, while keeping the input file ('-k').
For hard links, I assume it should work with '-k' when uncompressing.