When a sign is placed on the top or sides of a fence post, the sign appears blank and is not editable. However, signs placed and edited on fences in previous versions are intact.
MC-20168
Unable to edit signs when placed on fences
Resolved
Duplicate
0
Lukekwas26
(Unassigned)
Unconfirmed
fence, sign
Minecraft 1.6.1
Retrieved
You can't edit signs anyway.