Issue with SignalR scale using redis backplane in sentinel mode (HA)

I am trying to scale application that uses signalr with redis backplane in sentinel mode.

I don't even know if that is possible, but here are details:
asp.net core 6
Microsoft.AspNetCore.SignalR.StackExchangeRedis 6.0.2.

If i connect directly to master with:
"rds01:6379"
i can see program working as expected, that means that redis-cli with 'monitor' and 'pubsub channels' works as expected and i can see a list of subscribers there

If i connect in sentinel mode with:
"adress-public:26379"
ServiceName = "idp"

which triggers to sentinel mode according to stackexchange documentation,
i don't see anything with redis-cli like before, 'pubsub channels' gives me just "xxx___Booksleeve_MasterChanged" channel, but no hub channels like before so the whole thing doesn't work as expected

what am i missing here?