setDocumentExpiration hangs inside a batch transaction

@Test

public void testHangInBatch() throws CouchbaseLiteException {

    final int nDocs = 10;

    // Save 10 docs:

    createDocsInBaseTestDb(nDocs);

    baseTestDb.inBatch(() -> {

        long now = new Date().getTime();

        for (int i = 0; i < nDocs; i++) {

            String docID = String.format(Locale.US, "doc_%03d", i);

            Document doc = baseTestDb.getDocument(docID);

            MutableDocument mutableDocument = doc.toMutable();

            mutableDocument.setString("type", "TrashBinModel");

            mutableDocument.setString("dateOfDeletion", String.valueOf(now));

            baseTestDb.save(mutableDocument);

            baseTestDb.setDocumentExpiration(mutableDocument.getId(), new Date(now + 50000));

        }

    });

}