Similar happened to me and my OP a few months ago. Decided to buy/try a refurbished OP9 from Iode with their version of LOS pre installed. Very happy so far
Funny, not an hour ago I bought a 10 Pro - my OP5 (cheeseburger) is still going strong and rocking Android 14 - but because it's rooted there are critical apps I can no longer run 😭
That is to say: I'm definitely sticking with OnePlus.