As others have pointed out, the extensions are likely not (officially) compatible with the new version of GNOME yet. Which extensions are you having trouble with?
There are a couple of extensions that are available for installation through dnf for which Fedora takes care of making them compatible at the same time at which they make available a new version of GNOME. Caffeine and Dash To Panel are two examples. For a full-ish list, try dnf search gnome-shell-extension.
Alternatively you can also try manually editing the extension's metadata to "make it compatible". Your mileage may vary with this approach, but it worked fine for Net Speed Simplified, for example.
I was very certain that it was as well but it looks like it's just weirdly smoothed after being downscaled. Here's a source with a higher quality image: https://www.radiozwickau.de/beitrag/ausgebuexter-polarfuchs-haelt-nickerchen-in-weisskeissel-770885/
Edit: Or follow the link OP provided, I initially didn't see that.