I had the same issue, only I run Grafana in a docker-container together with Influxdb and Telegraf. Try to maintain an image for 32bit and 64bit and test them both before uploading to hub.docker.com. The 32bit was causing trouble and I didn’t have the time to throughly test what was going wrong. The 64bit-version is working fine. I upgraded my RPi4 to 64bit OS a few months ago.
I had tested with 8.5.0-beta1 on both 32bit and 64bit and that worked fine a few weeks ago.