There is a 5.2.11 tag and no 5.2.12 tag. Pulling the head of the tree results in a binary that says 5.2.13

ebergen@alien:~/bzr/5.2$ bzr pull
Using saved parent location: bzr+ssh://bazaar.launchpad.net/+branch/maria/5.2/
No revisions or tags to pull.
ebergen@alien:~/bzr/5.2$ bzr tags | grep db-5.2
mariadb-5.2.0-beta 2783
mariadb-5.2.1-beta 2816
mariadb-5.2.2-gamma 2870
mariadb-5.2.3 2883
mariadb-5.2.4 2894
mariadb-5.2.5 2929
mariadb-5.2.6 2967
mariadb-5.2.7 2993
mariadb-5.2.8 3019
mariadb-5.2.9 3033
mariadb-5.2.10 3067
mariadb-5.2.11 3130