Before you buy, check out Seamless 2: (it includes this product and might save you some money https://crmrkt.com/77X3Kj
Seamless Rotator is a one-click solution to pixel-perfectly rotate a seamless pattern while keeping the result seamless, too. The increase in canvas size will be indicated before you even rotate your pattern.
This plugin requires Photoshop 2021 or newer
Features
Interested in the algorithm / math?
Read more about that here: https://henke.design/blog/rotated-rectangle-fill-canvas