LB::reselect sometimes not reselecting

Hi I have such irule part

when LB_FAILED { 
        log local0. "LB Failed [LB::server]" 
        LB::reselect pool Pool-SecGW-crypt 
        log local0. "LB FAILED. Pool member $PoolMember re-selected = [LB::server]"         
        table set -subtable "Source_Map" $ClientIP "[LB::server]" 1200 
} 

when a poolmember goes down, sometimes it works (my LB::server value is showing new poolmember IP), sometimes not (no IP).

I read in the LB::reselect documentation (old, for v9.x) the following "Note that the reselect may not happen immediately; it may wait until the current iRule event is completely finished executing."

Any workaround to have it selected immediately (v11.x)? Thanks Alexandre