I observed this in the chart of my family and I and I found something interesting;
In one of my posts (in my tags), I actually bring up on how the Neptune energy is empty, which is why it is also easier to project on or causes confusion. Even in standpoint of astronomy, it is a planet that is just filled with air, but it's heavily inflated too. They can be equally as invisible as they are seen to other people.
Now, 12h sign and the themes associated with that might be the themes of what is missed in your previous life, or will be hardly accomplished and fulfilled in this lifetime, which is why 1h sign of yours will come out demanding the attention of things related to your 1h themes.
A leo rising will have cancer 12h, if we go by examples. By this logic, they'll crave family's validation but it will not be met to the natives' desire at all. Leo in the 1h is why they'd seek attention from outsiders to actually filling the warmth love and attention they never got at home (Marilyn Monroe came to my mind with this).
A libra rising will have virgo 12h. They'll be a perfectionist but unable to organize it and balance it out properly with (even mentally, virgo 12h), and likely riddle with fears, and that's why they balance it out by caring too much about the curation of things that they have more control over and the libra i know can and will deprive you of attention and love, and they also crave relationships where they can show that 'ideal' versions of themselves. If the image crumbles, they'd sometimes run away, but they'd spend so much time chasing after perfection that it destroys them.