The
.osu
file has this line inside:
BeatmapSetID: 748592
which is causing the issue. You can fix this by going to
File ->
Edit externally..., which will open a folder with the map files inside, at which point please open the
.osu file with a text editor, remove the line mentioned above, save, exit the text editor, go back to the game, and then click
Finish editing and import changes, at which point you can try submitting the map again.
I'm not sure where the set ID came from, there's no such existing beatmap set apparently and the ID is pretty old (must have been assigned somewhere around 2018).