Help - Transform cannot allocate a buffer larger than 30000 pixels in either dimension

I've been following this tutorial (https://www.youtube.com/watch?v=8x6Kn3pWsqc) to try and make a zoom transition between two clips on a project I'm working on. However, both my adjustment layers are getting the error "Transform cannot allocate a buffer larger than 30000 pixels in either dimension." I believe this is because I'm doing it in 4K rather than 1080p but I'm not sure how to get the effect without this error. Any help would be greatly appreciated!