How does Looker Studio interpret fields w/ same name, in different sources, when applying a filter?

I am building a dashboard and I have noticed that despite the fact the I have visualizations from two different data sources, a filter for a field on data source A also filters the visualization from data source B, using a column with the same name. However, when I tried to do this with a calculated field, despite haviong the same name, the same behavior was not verified. How does Looker Studio establish these relationships? Is it for data fields only and not for calculated fields? Is these any way to explicitly establish these connections?

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