Hello, today I recorded some very nice videos of fireworks but, somehow, they all got corrupted and I can't recover them. Is there a video cache in the DJI Go app? I know that in the editor the clips should be available, but I don't see them.

If you have it enabled, you should find video on phone/tablet with your Photo explorer. If it was disabled, bad luck.
Also try to recover from SD card, there are a few free programs that can recover video content.
Also try this:
https://fix.video/