Thanks for all the answers.
In short I have a variable in anim instance that I wanted to update on all clients, along with sever in exactly the same time, as frequently as possible.
And yes, it was better to switch to replicated variable and to on replication function, the only small difference was that this function won’t fire on server automatically. I will stay with that method.
The other thing is that problem, or maybe not, with RPC multicast function. Is there a chance that calling it too soon may cause some connection problems, and I don’t even think about calling it in each tick, but early in game flow at all.