Extruder temp false reading

After finishing a print yesterday (successfully) I saw that Update manager showed me i could update System (OS Packages). I updated this and this morning when switching on the printer it shows the extruder is 94 degr. C (While it feels room temp), i.e. ik looks like there is a 60 degr. offset (also the extruder fan is on as it believes it is required).

Any ideas how this is possible?
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