eosio_system_part2_tests failed in Savanna

[linh2931]

...unittests/eosio.system_tests.cpp(1816): fatal error: in "eosio_system_part2_tests/producers_upgrade_system_contract": critical check success() == push_action_msig( "alice1111111"_n, "propose"_n, mvo() ("proposer", "alice1111111"_n) ("proposal_name", "upgrade1") ("trx", trx) ("requested", prod_perms) ) has failed [ != assertion failure with message: transaction authorization failed]
0 exception: unspecified
rethrow
    {}
    unit_test  eosio.system_tests.cpp:1870 test_method

unknown location(0): fatal error: in "eosio_system_part2_tests/producers_upgrade_system_contract": std::runtime_error: Caught Unexpected Exception
...unittests/eosio.system_tests.cpp(1816): last checkpoint
.../unittests/eosio.system_tests.cpp(1957): fatal error: in "eosio_system_part2_tests/producer_onblock_check": critical check true == all_21_produced has failed [true != false]
0 exception: unspecified
rethrow
    {}
    unit_test  eosio.system_tests.cpp:1966 test_method

unknown location(0): fatal error: in "eosio_system_part2_tests/producer_onblock_check": std::runtime_error: Caught Unexpected Exception
.../unittests/eosio.system_tests.cpp(1957): last checkpoint

[arhag]

We want to figure out the root cause of these two failures and capture it in a more minimal test that does not use the system contract.