15w31a Sign Bug

When I update to 15w31a and I run my map
Changed ! - Any time you close and re-open the sign broken!
all sign will have prefix and suffix like this "anyword"
and no longer can use command [command in sign broken]
and sometime with null message
so I have to replace all my 50+ Sign [-X-]
[may be because I setblock a sign with no title 4?]