Grafana stopped displaying charts

[hufhend]

Host operating system: output of uname -a

docker: Linux d369f3590257 5.16.17-sun50iw9 #3.0.6 SMP Tue Aug 9 13:51:16 CST 2022 aarch64 GNU/Linux

snmp_exporter version: output of snmp_exporter -version

snmp_exporter, version 0.23.0 (branch: HEAD, revision: 20657d2)
build user: root@e4de29736f81
build date: 20230816-09:52:12
go version: go1.20.7
platform: linux/arm64
tags: netgo

What device/snmpwalk OID are you using?

Mikrotik

If this is a new device, please link to the MIB(s).

What did you do that produced an error?

I promoted to the new version, or rather the promotion was done by crontab

What did you expect to see?

I expected it to go further

What did you see instead?

Everything broke. First the message in the log pointed me to a new configuration file, I generated it. Then I searched for settings for auth=public_v3, but so be it.
I repeated snmpwalk, tried grabbing the data via snmp-exporter as well, edited the configuration in Prometheus, checked that Prometheus sees the tagret fine, and that leaves Grafana.
I wouldn't expect any more changes here, I use this dashboard and I suspect something must have changed in the instance variable as well.
I don't see any charts at all, nor do I have the option of selecting the correct instance. Does anyone know what to do about this?