SP3 parser fails when only some standard deviations are missing but not all
SP3 allows some of the standard deviations in position and velocity to be missing. It explicitly states: "If a standard deviation is unknown, its field is left blank".
The Orekit parser only checks the combination of the three fields in X, Y and Z, and not each field independently, it therefore fails if only one or two are missing.
See bug in v12 sp3 parser discussion in the forum.