Hi Zabbix Team

I use an item (SNMPAgent) to get serial number for 4k of hosts.

After upgraded from 6.4.11 to 6.4.12, this item return randomly String or HexString value

Exemple for one host, see screenshot

Before upgrade, update interval 1d, the value at 2h38am is : T1833006743080858

Upgraded to 6.4.12 on 29-02 at 7pm

Next value at 2h38 : 54 31 38 33 33 30 30 36 03 33 25 DO 38 30 38 35 38 (HexString for T1833006743080858)

Hundreds of problems are triggered on Zabbix server : Device has been replaced
I check this problem, and when Execute now or Test item, i have always good string value.
I make Execute now two times for this 4k item to revovery problems at 11h30am and 11h32am

The next value, at 2h38am is again a HexString.
I recheck with Execute now or Test item : Always string value.

I change update interval to 5m, and i see random HEXString or String value

Thans for your help.