The --version option does not show the version number

For the sigsum tools installed in debian trixie, using one of the sigsum tools with the --version option does not actually show the version, it only says "sigsum-key (sigsum-go module)":

$ sigsum-key --version
sigsum-key (sigsum-go module) 
$ which sigsum-key 
/usr/bin/sigsum-key
$ apt list sigsum-go
sigsum-go/stable,now 0.11.2-1+b3 amd64 [installed]

So apt list sigsum-go shows the version number 0.11.2 but sigsum-key --version does not show that.