My guess would be that there is an issue with DS18B20 on ESP32 see this https://github.com/letscontrolit/ESPEasy/issues/1833 to quote "Please note that the set of plugins included in the esp32test_1M8_partition is highly experimental." If you want to recover your ESP32 you can do a chip er...

Just to complete the above discussion here is a partition bin file that can be used to flash the larger firmware.