1.4.1 fails with complicate triggers

[BusteR81]

currently my live zabbix server 1.1.4 works with this trigger for 1 year with great accuracy when comes to alerts BUT not 1.4.1 because the trigger never hit TRUE

Trigger purpose: to detect a Sudden Drop with >-20

pls see attached images.

Note: there should be a '(' on the start of the trigger which i cut and paste to do image editing missed

[BusteR81]

1.1.4

this is the trigger that i had with 1.1.4 which is still working now. u will notice a slight difference in expression But ultimeltly the outcome should be the same.

keys are same only named differently