Blueprint client debugging doesn't work on 4.10

I set a breakpoint at some place in a blueprint but the break will occur on the server VM and not the client VM.
The breakpoints are set in an ACharacter derived blueprint.
This is while using PIE with the PIE as a listen server.
I have verified that the blueprint is running on both VM’s via PrintString.

Is this a known issue?

Many thanks

[Edit] Just to add - I can see both “server” and “client 1” Debug Filter worlds when the server VM breaks.