RV adapters are wired different the EV adapters. EV stations do not use a Neutral wire. Here is an adapter wired correctly for EV use.
RV adapters
NEMA 14-50 5-15
Hot 1 Hot 1
Hot 2
Neutral Neutral
Ground Ground
EV adapters
NEMA 14-50 5-15
Hot 1 Hot 1
Hot 2 Neutral
Neutral
Ground Ground