Two events come into SM simultaneously but only one is processed

[Roman Prykhodko]

We have two similar events (for different sagas) come in State Machine in the same time in the same handler. Only one of them switches it's saga into expected state. The other one is processed but saga remains unswitched. 
There is no any error in log, error queue is empty.
Please assist!

[Pavel Mihailov]

Which persistence are you using? Which version of MassTransit ?

[Roman Prykhodko]

EntityFrameworkSagaRepository

Masstransit 5.1.5

[Pavel Mihailov]

Core or Full framework?

Which Concurrency mode are you using?

https://masstransit-project.com/usage/sagas/efcore.html

https://masstransit-project.com/usage/sagas/ef.html

[Roman Prykhodko]

Core, Optimistic mode

[Pavel Mihailov]

Is your RowVersion of Saga entry increased 2 times? Can you share some code sample of your handle event handle block? 

Have you tried logging consumed events?