Most likely we're seeing Subaru switch to multicolor RTV in the middle of production to "debug" a sealant issue. They probably found out something, switched to multicolor to find out which sealant affected the oil passage/pickup blockage the most. Maybe like red for blockhalf, green for upper oil pan etc. looks like not everyone sees the multicolor yet.
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Petah78 if you look around your valve cover / timing cover do you see any different coloring of RTV?