These animations are also working normally for me. Within Blender, in the animations timeline, the animations have a duration of 2 frames. Try switching to 150 frames and see if it works. Maybe I exported it with only 2 frames when uploading it to Itch. Please, tell me if it worked.
There are 150 framesb ut only 2 keys.It doesn't work if I drag the last key to the end.
It won't make a difference. I tested the 2 files, the unity project and the separate files, and both worked normally when I exported from blender. I also tried exporting them again and when I opened them they were working the same. I really don't know what's going on in your case. Unfortunately I can't help you. Sorry.