selected values in drop-down select in QueryBuilder doesn't clear when we change datasource

[Slach]

Create query
Home -> Dashboards -> add new dashboard -> add visualization

choose gh-api as data source
select database, table, timestamp field and timestamp type, last 5 years time range
press go to query

got results

change datasource in query to clickhouse

got minor unexpected behavior

clear values

but old values still present in drop down

• git_clickhouse database doesn't present in system.databases in clickhouse data source
  

• commits doesn't present in system.tables in clickhouse data source