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It's mostly a phone issue. The adapter advertises its presence, and the phone wants to connect to it. If you can block the phone from connecting to the adapter, everything will be fine. If you want to go the route of using a power/data splitter, this cable does what you want: https://www.amazon.com/dp/B0CZDFGJY5 Don't be surprised by the product description; it is wrong; this cable does separate power and data. Also, many people make such a cable themselves. Finally, one can get a regular splitter and use a power blocker on one leg (e.g., https://www.amazon.com/dp/B094FYL9QT). Finally, people claim the data port is always powered, but that's not the case. After turning the car off, though, it will be powered five times for a few minutes each within a period of 2 hours. Anything that connects to the adapter during that time may keep the port awake a bit longer or cause a sleep state that is less deep and that may drain the battery a bit more than a normal sleep state.
https://www.amazon.com/dp/B0CZDFGJY5?ref=ppx_pop_mob_ap_share I use this and it works as intended