Modified /etc/smartmontools/run.d/10mail to workaround https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900244

10mail.sh

#!/bin/bash -e

# Send mail if /usr/bin/mail exists
if ! [ -x /usr/bin/mail ]; then
	echo "Your system does not have /usr/bin/mail.  Install the mailx or mailutils package" 
	exit 1
fi

# workaround debian bug 900244
if [[ $SMARTD_MESSAGE == "Device: /dev/nvme1, number of Error Log entries increased from"* ]] && \
	[ $(/usr/sbin/nvme error-log -o json "$SMARTD_DEVICE" | \
		jq '.errors | map(select(.status_field |
			IN(0, 8194, 16388) | not)) | length') -eq 0 ]; then
	echo "Spurious error count increase, not sending mail."
	exit
fi

input=$1
shift

/usr/bin/mail "$@" < $input

From my observations, the apparently spurious error log entries have status_field values 0x2002 or 0x4004. The second part of the condition checks that those are the only entries before suppressing the email notification.
I think the meaning of status_field is according to the following bits nvme.h