Sentinel-3 OLCI level-2 products of OTCI vs OGVI

Have you ever been in that situation?For the same pixel of sentinel-3 OLCI level-2 products, OGVI has value but OTCI was in no data. As shown in the figure, the original level 2 product just downloaded and has not been preprocessed such as reprojection and resampling.1

It could happen that OTCI and OGVI have different thresholds for considering valid pixels. I advise to look at the ATDB for clarification.

Thank you!