Targeting bug

[Piripippeli]

I play with two characters.

When one character's client has not been active for about 5 minutes, its targeting breaks for about a 10-20 Seconds.
The target UI does not appear, and the character does not start moving toward the target.

Even if I click on an enemy or a party member, nothing happens for about 10–20 seconds.
After that, it starts working normally again.

And this bug only happens when Toolbox is running.
(Also I have the latest beta build installed.)