Kia: unknown Elect_Gear_Shifter value 9

Sometimes we see a CAN message for `Elect_Gear_Shifter` with a value of 9 on our Kia e-Niro.
It is supposed to be defined as follow:
https://github.com/commaai/opendbc/blob/40d9c723d48496229fecc436046538a53af19c11/hyundai_kia_generic.dbc#L1519-L1520

And the values:
https://github.com/commaai/opendbc/blob/40d9c723d48496229fecc436046538a53af19c11/hyundai_kia_generic.dbc#L1658

With this current definition I would expect the max value to be 8, is that correct?

Anyone already seen this? Otherwise I'll try to do some tests when I get access to one of those vehicle.

Review the Elect_Gear_Shifter definition and value table at the referenced lines in hyundai_kia_generic.dbc, then investigate CAN messages from the Kia e-Niro. Confirm whether value 9 is valid and update the DBC definition if vehicle testing verifies it; otherwise document the finding.

Written by the indexing model from the issue text.