Traces with 64 bit IDs cannot be queried by trace:id

[carles-grafana]

Describe the bug
Queries such as { trace:id = "26592c9ca6385" } return "0 series returned" even though the trace does exist.
This only happens when the trace id is 64 bit. When it is 128 bit, such as { trace:id = "fa4781118759fea1e7226976e0ef5c14" }, the result is as expected.

To Reproduce
Steps to reproduce the behavior:

1. Open Grafana Cloud -- Explore a Tempo data source (tried on branch r178)
2. Query {}, find a short trace id and then query it with {trace:id = "<traceid>"}
3. It doesn't return anything.

Expected behavior
The trace is found and returned.

Environment:

• Infrastructure: Kubernetes
• Deployment tool: jsonnet