From desktop PS use the blue share button with 'invite to edit' to save a PSDC file to share with a colleague. When that colleague goes to the CC desktop App -> Files -> Shared with me, the time stamp on the new file will be 53 years ago. Timestamp only updates after some new action has updated the file.
The problem with this bug is that the person with whom the file was shared then has to scroll through dozens of images to find the new file, when it would be naturally expected that the new file would have the latest current timestop and would show up at the top of the folder as the most recently added or modified item. If that person is someone who is handling multiple files from several different people daily and doesn't yet know what the thumbnail looks like then it can be hard for them to find the file.
Expected behaviour - any newly created PSDC file has a current time stamp instead of 53 years ago and can be located easily at the top of the 'shared with you' folder.