In that case, why not eliminate half the code in that loop?:

sub validate_properties {
    for ( @{$_[0]}  ) {
     $_->{supported} = .5 < rand;
    }

}
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Or even inline it as: $_->{supported} = .5 < rand for @array;?

Based on the (modified) original post, it should be $_->{supported} = isSupported($_) for @properties; rather than random.
I don't see how saving the results of an isSupported() test could be described as "validating properties", but I suppose that's a lack of context speaking.