RepNotify / Multicast never called on Rift client with Quest hosting

We
have a weird issue where replication - RepNotify and Multicast functions - is not working for an actor component. The component and owning actor are both set to replicate.

I
don't think it is a case of things not being loaded in time, because
this doesn't happen until 30 seconds or so into the level gameplay. From
printouts, I can see the call happen on the server, and the RepNotify
happens on the server, but it never happens on the client (if the client
is a Rift). Addtionally I have a test printout of the value of this
variable, and it is not a case where the value is already set to the
desired new value.  When I switched to using Multicast instead of a RepNotify, the multicast function is never called on the client.  This problem only happens when the Quest is the server and the Rift is the client.  Rift->Quest and Quest->Quest work fine.

Anyone
know of any problems like this? I can't figure out why it would be
happening here, when we use RepNotifies elsewhere all the time without issue.

Thanks!