I often face this issue. The fingeprint sensor does not work and sometimes the touch also misbehaves when phone is charging.
Why does this happen and how to fix this?
I experienced this issue with Mi Note 4, as well as Redmi 4A.
Why does fingerprint sensor not work when phone is charging?
Question
Answer
As requested by OP posting answer, in response to my comment (now deleted) based on my experience
Having a clean power supply, using original charger + USB cable, setting up finger prints again are the common things that work...
I am not sure as to why touch sensor works only with original charger but posting as it may help, as it helped OP
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