I don’t believe anyone who has met their twin flame is fully experiencing it in the 3D. To me, that would suggest that it is purely limerance. It would be like pretending to be a Porsche driver just because you have a cap with the logo.
That said…
5D interactions exist on a spectrum. Some people have vivid telepathic conversations and shared dreams from day one. Others work primarily on a subconscious level for months or years before conscious awareness develops. Both paths are completely valid. Third eye chakra blockages are really common and they directly affect telepathic abilities. So are blocks from fear, doubt, or just not being at that stage yet. Divine timing determines when these abilities emerge, not how hard you try to force them.
Focus on your inner work and the 5D stuff tends to unfold naturally.