LoRa-E5 STM32WLE5JC Module registration submit failed

trying to register end-device:
LoRa-E5 STM32WLE5JC Module, embedded SX126X and MCU for LoRaWAN Network MAC V1.0.2PHY V1.0.2 REV B Over the air activation (OTAA) Class C.
EUIs derived from module serial interface
Profile AU915-928 (FSB 2).
Hardware v1.0, firmware v1.0

After entering the EUI data and submitting I get the following error message:
Submit failed
invalid value of field mac_settings.ping_slot_frequency.value

Could someone direct me towards the location where these parameters are kept - there seems to be nothing in the registration page that allow me to access these settings, or even any indication of what value is valid.

Found this is a known problem. Of course.
See: Example for adding Grove - LoRa-E5 to TTN - LoRa - Seeed Forum for a solution - manual registration.

You can fix this by cloning the github repository, updating the value and creating a pull request.