See https://developer.apple.com/documentation/metal/mtltexture/1515679-replaceregion

This method runs on the CPU and immediately copies the pixel data into the texture. It doesn’t synchronize against any GPU accesses to the texture. Ensure all operations that write or render to the texture complete before reading the texture’s contents, using one of the following methods:

Instead if we need to synchronize we can use a blit pass: https://developer.apple.com/documentation/metal/mtlblitcommandencoder/1400752-copyfrombuffer?language=objc

We could keep using setContents to populate the initial texture data, but any subsequent updates will need to use a blitpass to be safe.