Query: No StoreAPIs matched for this query still present for stacked Queriers in v0.31.0

[richardtief]

Thanos, Prometheus and Golang version used:

Thanos: v0.31.0
Golang: go1.19.7

Object Storage Provider: Openstack Swift

What happened:

Follow up on #5862. Requests on a stacked Thanos Querier still led to:

Error executing query: expanding series: proxy Series(): rpc error: code = Aborted desc = No StoreAPIs matched for this query

What you expected to happen:
Expected that this should be fixed in v.0.31.0, because of #6082

How to reproduce it (as minimally and precisely as possible):

Any stacked Thanos Query setup with queriers within the same cluster and one issuing gRPC requests from another cluster with cert handling.

Full logs to relevant components:

Anything else we need to know:

There are multiple Thanos Queriers registered as Stores. Using Store filtering in UI make it work.