Specifically here:
https://gerrit.fd.io/r/#/c/2646/2/infra/data-impl/src/main/java/io/fd/honeycomb/data/impl/ModificationDiff.java@117

We have to manually ignore modifications that have before and after data identical (which in general should not be marked as modification) by invoking:
.filter(ModificationDiff::isBeforeAndAfterDifferent)

Commenting out that line and running tests should demonstrate the issue.
It appears mostly(only) with keyed lists.

• This might be ODL issue or just a weird ODL behavior
• This was observed on Beryllium SR2