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JDK-8038423 introduced a G1 specific virtual space manager. It does not implement the AlwaysPreTouch feature, simply ignoring it.
This causes some workload (e.g. Specjbb2005 with 120G heap) have a very long first full gc with large sys time.
SQE is okay to defer.
ILW = H (regression) L (AlwaysPreTouch is used infrequently) H (no workaround) -> p2. However, this affects performance only, not correctness and should only be seen during one gc over the lifetime of the JVM, so p3 is appropriate.