As title says, FAL still spawn in helicrash and Convoy events but the 1.23 patch notes said they would be moved to gas zones.
In 1.23 Experimental servers I found a FAL in a convoy near Vybor and yesterday I found a FAL in an american helicrash near Kamensk
So I guess this is a bug or something wrong with the patch notes... I did found AS VAL in Tier 4 in Tisy as the patch notes says.
I don't know if this can be a bug, but I decided to report it here