Hello, and thank you for the feedback!
- Are there any specific steps to reproduce the issue? I'm testing it at the moment and the preview appears to be correct.
- Center in Resize Canvas is not the same as the old "Centralize Image" option. It's used to automatically set the offset of the image content to the center, if the canvas size is changing. Instead, you are looking for the "Center Frames" option, which can now be found by right-clicking a frame button in the timeline (the ones with the numbers). Selecting multiple frames and selecting "Center Frames" will work on all selected frames.
- Try using "Paste in Place" (mapped to Alt + Control + V by default) instead of regular "Paste". "Paste" always attempts to place the content at the center of where you are looking at, "Paste in Place" will paste at the original position the content was copied from.