When the player walks into a ''lonely'' iron bar, the player starts to glitch out and gets sort of stuck. This happened to me in a server when i walked into a 1x1x2 area of iron bars.
MC-105372
Getting stuck when walking into ''lonely'' iron bars
Resolved
Invalid
0
Invalid as this issue happens only with modified servers. The server is on an earlier version than 1.9 where the iron bar model was changed. Your client sees the iron bar a different way than the server.