Cross-project-area links using 'Satisfies' link type disappear under Baseline
One answer
When you create links between project areas, the link information is not stored equally - each link consists of two ends and the project area containing the outgoing link end stores most of the information, while the other project area containing the incoming link end only stores a 'back link'.
Baselines are project area specific, which means that only the outgoing link end is fully captured in baseline data. If you look at both sides of the link, you should find only the outgoing link end is visible in a baseline