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Start playing to the device while on home wifi, then leaving the wifi range, and JRemote continuing to work?
That transition in connectivity (from your home wifi to the cellular network) would no doubt then require JRemote to switch what IP address it is using to reach your running MC server. Perhaps iOS / iPadOS provides some sort of trigger for applications to be notified when such a networking change has occurred? Otherwise, I've no idea how JRemote would even "know" something has changed.
It seems like such a "networking has changed" trigger is currently absent from JRemote?
Edit: spelling