Multiregion: BigQuery persistent errors for some customers' DML operations

Summary: Multiregion: BigQuery persistent errors for some customers' DML operations Description: We are experiencing an issue with Google BigQuery. Our engineering team continues to investigate the issue. We will provide an update by Thursday, 2022-09-29 11:30 US/Pacific with current details. We apologize to all who are affected by the disruption. Diagnosis: Some customers may experience persistent INTERNAL_ERRORS performing DML on some tables with internal debug info and will contain an error message: "Source storage for $project:$dataset.$table is not available in write target $cell" Workaround: Affected customers should still be able to query or copy their tables.