Steps to reproduce:
# create ticket T1
# create T2
# open the page for T1, click "edit blocking tags"
# add T2 as blocker
Expected results: there will be a record on the T1 page telling who and when added the blocker, and a similar record on the T2 page for the dependency.
Actual results: none of that happens. (Haven't tested but my impression is email notifications don't get sent either.)
Same for removing blockers.