Is this a fresh install of Fedora Workstation or did the problem occur after an update/upgrade?
Does the problem occur from a power off reboot?
Problems like this are often hardware dependent, so you should provide details, including the graphics card and driver.
journalctl -b is the first place to look for error messages, but it is very wordy. Chances are you are not the first to experience the problem, so searching for issues with a similar history and hardware may be the fastest path to understanding why this happens.
This might have been overkill. Something in ~/.local/share/gnome-shell/extensions/ could be the real culprit, and you might miss some of the extensions. You could look for bug reports against the extensions in gnome-shell.bak or enable them one-by-one until things break (and file a bug report).