Drop counter having no effect

[Relax]

When I press "switch quick drop counter" key, the debug tab shows the drop counter incrementing. But then I press the "quick drop N items from 0 slot" key, only 1 item is dropped irrespective of the value set for drop counter. However I found it to be working correctly on test server, i.e. on test server if drop counter is 3 then 3 items get dropped at once but on normal server only 1 item gets dropped.