As you noted, the ICN2037BP should be supported: ICN2037 support - #7 by Mori
I don’t see any other clues from the back of the panel to explain what’s going on.
You say the data is absent in the skipped rows, but then you also said you have the same problem as a user that showed a picture of rows being spaced too far apart, do you think you should show a picture of the same FastLED functions sketch as that other user so I could compare?
Running the multi row mapping sketch might help but I’m not sure.