Many To Many attaches values even if there is no primary record.

[dschoenbauer]

Describe the bug
When using the one to many data provider, the records from the embedded data side regardless if they are present in the parent or not.

To Reproduce
Steps to reproduce the behavior:

1. Attach two data providers together with the many to many data provider event
2. Have records in the source data not present in the data to be embedded
3. See empty records with the embedded data

Expected behavior
If a record is pull in the embeddable data it should not be seen in the primary data source.