Problem loading ISO-8859-1 into BigQuery using DataFlow

Hi all,
I'm trying to load an ISO-8859-1 file into BigQuery using DataFlow. I've built a template with Apache Beam Java. Everything works well but when I check the content of the Bigquery table I see that some characters like 'ñ' or accents 'á','é', etc. haven't been stored propertly, they have been stored as �.

I've tried several charset changing before write into BigQuery. Also, I've created a special ISOCoder passed to the pipeline using the method setCoder(), but nothing works.

Imported from Jira [BEAM-7826](https://issues.apache.org/jira/browse/BEAM-7826). Original Jira may contain additional context.
Reported by: Israel.