failed to load json config (NRZ-2021-134-B4 (22 Aug))

[Phaze-III]

Under certain circumstances NRZ-2021-134-B4 fails to parse an updated configuration file with a setting "Höhe über Meeresspiegel (m)" that has more than 1 digit as height above sealevel. So 0 to 9 will work, 10 or higher fails. This appears to be related to disabling the auto-update feature.

Steps to reproduce:

1. erase flash and flash firmware.sensor.community/airrohr/beta/latest_de.bin
2. configure sensor with at least "Lade Beta Versionen" enabled to prevent a downgrade to release and debug level to 5 to get more debug info
3. under Sensoren set "Höhe über Meeresspiegel (m)" to 25 ( a two digit height)
4. save and restart
5. the sensor will reboot and have the correct height configured.
6. disable the Auto-Update completely
7. save and restart

The sensor will restart but the change in step 6. is gone (Auto-Update still enabled). In de debug output it shows:

mounting FS...
opened config file...
failed to load json config
opened config file...
parsed json...
output debug text to displays...

Basically the new config fails to load, falling back to the previous version.

The same steps using a height below 10 (1 digit) does work.

Note that writing a 'failed' config two times in a row results in no configuration at all (both current and previous fail). Should this be a separate issue?