(Recursive) nested loops and IFs?

[chromos]

Does anybody know why this stopped working in latest Prime firmware?
(in L5 are stringed expressions, something like "(A+B)").

PHP Code:

IF ΠLIST(EXPR(L5+">=0") AND EXPR(L5+"<=9") AND EXPR("FP("+L5+")==0")) THEN 


I replaced it with:

PHP Code:

IF ΠLIST(EXECON("EXPR(&1)>=0 AND EXPR(&1)<=9 AND FP(EXPR(&1))==0",L5)) THEN 


... and this works, so I don't need another solution. I'm just curious why former code no longer works.