Since 17w15a fence posts have been changed to connect to solid faces of stairs but they also connect to:
-pressure plates
-buttons
-signs
-banners
-vines
-string
-tripwire hooks
-levers
-rails
-nether brick fences
MC-115871
Fence blocks connect to specific blocks they shouldn't connect to
Resolved
Duplicate
0
The search engine didn't show me the other bug report. It is a duplicate.