Environment

Jmix version: 2.8+

Bug Description

Reproduces only with not saved entities.

When we have association with bidirectional reference it causes recursion to reach the same managed entity again, DataContext#mergeList() re-enters and writes to the same dstList as the outer call, producing duplicate elements in the owner's collection.
For instance:

• ProductSet with Product collection
• Product with ProductSet link

Steps To Reproduce

1. Download demo: datacontext-demo.zip
2. Launch the application
3. Open "Product sets"
4. Create one, do no save
5. Create Product 1, Product 2
6. Edit Product 1, edit Product 2

Current Behavior

After saving editions in Product 2 there are 4 rows with duplications instead of 2 rows.

Expected Behavior

2 rows with changes we've made in editor.