Thanks! That would be great if confirmation can be obtained.
I was confused because I noticed the same NODATA values over the water areas on such produced L2A products with the new Sen2Cor 2.10 (despite processing 2018 L1C products) - as mentioned in: No-data in the sea resulting from sen2cor 2.10.01 - #5 by bdpg.
My thinking was that this should not happen with older L1C products, despite being processed with the latest L2A 4.0 Sen2Cor.