I'm still experiencing this issue on the Switch console.
I only play in one realm so I'm not sure.
I’ve been having this problem on the Switch too.
There's been a slight issue with frozen screens too; the cursor moves in the opposite direction its supposed to, and I have to exit and reload to get it going again. I've removed this from my original report after I read the rules. My apologies!
The issue has been resolved with the new update but I believe my shulker box is gone for good.