I can only imagine that your company decided to associate WAI deselection during final with L/G extension.
Airbus proc extract:
-FLAPS FULL SELECT
Select FLAPS FULL below VFE.
-CONFIRM/ANNOUNCE "FLAPS FULL"
Check deceleration towards VAPP.
-A/THR CHECK IN SPEED MODE OR OFF
-WING ANTI ICE OFF
Only switch the WING ANTI ICE to ON, in severe icing conditions.
For Airbus, it comes after Flaps extension.
I don't think that it's related to OEI condition as you quote FCOM 3.03.18, normal procedures.