zbxlog send correct data to the zabbix server.
But all trapper messages seem to be truncated around 300 byte and therefore the data is not in the database are stored.

Please look on this thread in the zabbix forum, you will find all information here (debug files, configs etc.)
At beginning Post Nr. 158
https://httpwww.zabbix.com/forum/showthread.php?t=19180&page=16

thanks for bug fixing