Graphite metrics without tags don't show up since v5 migration

I believe our Grafana Cloud instance was upgraded from Graphite v4 to v5 recently. Since then, we are not able to display any data without tags.

For example, this doesn’t work (no tags):

{ name: '', value: ... }

This does work (tags):

{ name: '', value: ..., tags: { test: 'foo' } }
{ name: '', value: ..., tags: { test: 'bar' } }

We push our metrics directly to Graphite using the HTTP API. In both cases we get a successful response from the API. The data just doesn’t show up in Grafana…

Could this have something to do with the new “storage-schemas.conf” thing? If so, any idea what we need to do to fix this issue?