that was a system expression if im not mistaken, and i didn't even noticed is gone lol till you mentioned it.
its still available in C2 runtime >> advance setting from project settings change runtime from C3runtime to C2runtime... and then it appears back in the system expressions.
however since you change the runtime you will lose functionalities like bbcode for text objects and other features C3 objects might have.
that as now i think is only for C2_Runtime maybe soon will be ported to C3_Runtime also.