Because AoE axe weapons don't extend axe item, they

1. Cant receive axe enchants (only mending and unbreaking work)
2. Cant disable shields
3. Cant strip logs

3 isn't necessarily bad, but its something to be aware of if you decide to fix this

Closing all bug related issues as I just pushed a big update. (many changes to the code)
If the issue is still there, please create a new issue and provide new log files.

The 1.8 update is currently BETA which means it's not ready for stable worlds. If you are playing multiplayer I suggest you wait for a release candidate.