@User49462 - you can only have one permanent residence at a time. It's a 'part year' resident., not a 'part time' resident.
Where are you registered to vote? where were your cars registered? what state provided your driver's liscence. Where do you get your mail. THAT is your permanent residence. if the answers to those questions mean that you were a permanent resident of another state all year in 2021, despite the fact that you had reasons to be in CA from January until April, you are still a permanent resident of that other state,. You'll file in that other state as well as a non-resident in CA.
if you 'officially' moved in 2022, meaning you changed where you can vote, get your mail, register your cars, etc. then from Jan 1 until you 'officially moved', you are a resident of that other state and then a CA resident from that date forward. In 2022, you'd file as a part year resident in both the other state and CA.
In 2023, you would be a full year CA resident (assuming you don't move again!)'
Look at Section G and H on Page 5
https://www.ftb.ca.gov/forms/2020/2020-1031-publication.pdf
