Glass panes, fences, iron bars and cobblestone walls sometimes fail to upgrade

The bug

After upgrading, glass panes, fences, iron bars and cobblestone walls which were previously connected to blocks are no longer connected.

Examples

• Fences

  /tp @s -106.72 85.00 449.47 -431.18 3.55

• Iron bars

  /tp @s -110.71 68.00 451.82 70.01 8.92

• Cobblestone walls (invisible due to MC-127116)

  /tp @s -95.32 66.00 455.91 450.00 5.24