Problems typing symbols "&" and "(" in multiselect

Open an existing host in massupdate form.
Select "Add new or existing host groups" and start typing a group name.

For 3.4 type "(" twice and see it being replaced with "(new)(" each time or type "&" twice and see it being replaced with "(new)".
For trunk type "(" or "&" and see it's not even possible.

Works fine in 3.0