Wrong MCU temp reading after adding BME280

Basic Information:

Printer Model: Voron 2.4
MCU / Printerboard: Fystec Spider 2.2
Host / SBC : RPi 5

Describe your issue:

After connecting and configuring BME280 in printer.cfg, the mcu temperature shows -78 C and the reading from BME is correct. Any suggestions?
Part of my printer.cfg:

[temperature_sensor Spider v2.2]
sensor_type: temperature_mcu
sensor_mcu: mcu
#min_temp: 0
#max_temp: 100

[temperature_sensor Chamber]
sensor_type: BME280
i2c_address: 118
i2c_mcu: mcu
#i2c_bus: i2c1a
i2c_software_scl_pin: PB8
i2c_software_sda_pin: PB9
i2c_speed:100000

klippy.log (81.6 KB)

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