Slitherine

The 4th transport slot (in units.csv) is bugged, making these supported transports not appear in the game.
For example:
1Japan1941, NewZealand: no Type1_Ho-Ha for infantry
2Allies1941, Okinawa: no m3a1_halftrack for infantry

The no-transport slot also counts to the number of supported transports in the transport-column of units.csv, e.g.:
[no transport], us_truck, m3_halftrack, m3a1_halftrack, lvt_2, lvt_2_naval, dukw, dukw_naval

Workaround: double-entries for transports, e.g.: type94_truck, type98_so-da, type1_ho-ha, type1_ho-ha, type1_ho-ki

Thanks for reporting. It's caused by a code logic bug in the production panel. Fix will be released soon.