Inconsistency between cache and database using optimistic 'true'

[andyjefferson]

We discovered a situation in which Datanucleus does not create SQL statements for changes made in persistence capables.
If a one-2-many relationship realized via HashSet is updated multiple times in different transactions, the DN cache provides other data than the database.

You can find a test case reproducing this issue at Github: https://github.com/nbartels/test-jdo/tree/bug8

Please provide a fix for the 4.X branch, too.

[andyjefferson]

Can't reproduce with current code.