Grafana trace streaming panel

Grafana Dashboards
,
1

I enabled traceQL streaming feature toggle by
[feature_toggles]
traceQLStreaming = true
featureToggleAdminPage = true
And My panel sometimes shows Streaming Progress but sometimes not(10% shows).
I want to show streaming progress everytime.
How can I do it?

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2

I found that if I enter explore page, the panel will always shows Streaming Progress option, is that a bug?
And only if it shows Streaming progress, the server request tempo(trace datasource) by streaming.