Once I start to use timechart and simplify the query this way, I don't get anything back. Is it a wrong syntax?
| multisearch
[search index=same-index source="same-source" "first-query-static-text" | eval seriesName="First"]
[search index=same-index source="same-source" | regex log="second-query-regex" | eval seriesName="Second"]
| timechart span=1d count by seriesName
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