The current stable version (2.5.1-r1) doesn't support the --overwrite-tags option which is needed to fix bug 446422. Version 2.7.0 is in the tree since more than one year.
x86 stable
commit be4d03521be8a46880a5184257bd3066e12e63f1 Author: Rolf Eike Beer <eike@sf-mail.de> Date: Tue Feb 6 22:00:27 2018 +0100 dev-vcs/bzr: stable 2.7.0 for sparc, bug #646764
ia64 stable
hppa stable
amd64 stable
Stable on alpha.
arm stable
ppc64 stable
ppc stable Last arch. Closing.