NEO/ZODB3 was using transaction 1.1.1, but ZODB3 was fixed to follow transaction 1.6.1 in 2016:

https://github.com/zopefoundation/ZODB/commit/d8409616

Actually ZODB3 tests fail with transaction 1.1.1

https://erp5.nexedi.net/test_result_module/20201123-60855473/6