PVRTexTool sets orientation metadata that is incorrect in 2 ways: it is called
KTXOrientation but it should be
KTXorientation, note the lower-case first
o, and it gives values for 3 dimensions even when the texture only has 2 dimensions and most likely also when it has only 1 dimension.
This bug has been present a long time and is still in 2019_R1.1.