These issues haven't changed since the 2018 Photoshop cc upgrade (Mac version. For PC version, I wouldn't know). When using a 3D Color Lookup at the top of the layer stack (.cube file) and subsequently trying to use Color Range underneath, virtually every color is chosen except for the pixel that's clicked on. This is hugely annoying, especially when working with a large layer stack. Only when the 3D Color Lookup layer is switched off will the Color Range function work properly again. Also, bug number two, when needing to use two 3D Color Lookup layers in the same layer stack (when matching to reference in a different color space for example), Photoshop slows down to an impossible crawl once the file is barely even a GB in size. These issues really need to be sorted out. Thanks.