This is a beta build of ProtocolLib with 1.9 support. It's a beta build because it has not been fully tested, nor is it backwards compatible. I will work on restoring backwards compatibility and further testing for the full release.
A side effect of the 1.9 update was the changes made to data watchers. Basically, Mojang added a bunch of bloat, so I was forced to add that same bloat to ProtocolLib, which broke backwards compatibility.
Special thanks to @NavidK0 for his help with data watchers and testing with LibsDisguises, as well as all of you who provided bug reports and support in the issues section!
If you like ProtocolLib, please leave a review or consider donating. It really means a lot.