Additional Notes that may help...
I couldn't upload a video due to size so took some screen shots of the video.
Must also add that my Girlfriend who also uses my Switch can load up to Mojang screen almost immediately after clicking on the game and her profile. We both have a Microsoft account linked and both have our saved data backed up on the nintendo switch online cloud.
Okay so today after 2 hours of trial and error. I've somewhat fixed/identified the issue. After 3 attempts of deleting my data and reuploading again, I noticed whenever my saves were present it would take forever to load. But after deleting everything and starting from scratch with just my XBL profile it seems to load almost instantly again...
So my conclusion is the game or the Switch is getting lost trying to check either the backup data, or when redownloading a map from a previous update through cloud it has something get corrupted.
But hey I'm not a programmer