Two consumers in the same group can`t read different topics

I have a Spring application that contains 2 different consumers(that subscribed to different topics). It looks like: consumer C1 → topic T1, consumer C2 → topic T2. Both consumers are in the same group (they have the same group id). And I have trouble reading with both. It looks like they take turns working.
Can anyone help me, how it works in this case?

Number of topics doesn’t matter for consumer groups, really only partitions do

One consumer could be assigned all partitions (from all subscribed topics). In this scenario, no other consumer will read anything, since it is part of the same group, and not assigned any partitions…

You can add a subscription listener to Spring-kafka to see what partitions are assigned where