Lost all items without dying and spawned at world spawn point upon logging in.

The most likely reason this would happen is if the game didn't recognize your gamertag as someone who had ever played the world before. Is there any possibility that someone else had used your device and signed themselves into Xbox Live? You could fix that by signing out and signing into your account. Failing that, did you modify your gamertag, perhaps to correct spelling or capitalization?

I experienced this same issue, immediately after upgrading to v1.2.3.

After several minutes/hours of play, I quit a game normally from a safe spot within a well-appointed home, with the game saving as expected. Before playing again, I upgraded to v1.2.3 (also iOS, iPad 2017). The next time I played, I found myself at the original spawn point with no inventory and no experience points. The world seemed the same as I had left it when I had quit the last session, including items cooking in a furnace inside that nearby home, but instead of being where I'd quit, I was at the original spawn point. I reequipped myself and gained some experience, then needed to quit. Before quitting, to fend off a repeat of the issue, I offloaded a few key inventories items into a chest. When I next played, I reappeared at the spot in the well-appointed home where I had quit before the upgrade, with all of my original inventory and experience points, though none of the new inventory. Interestingly, the key items I had offloaded into the chest were still there...

But wait, there's more. The next time I played I was back as the second version of me, with partial equipment and partial experience points. After quitting, shutting down, restarting, and playing again, I was back to the first version of me, with full inventory and experience points.

Before I keep going, I figured I'd share what I've observed, and ask if there's any specific troubleshooting steps I could take that might shed light on this interesting issue.

I’ve encountered this bug several times now, and upon forcibly closing the game and then relaunching it, it seems to temporarily fix the the issue until the next time I log back into the world and the bug reoccurs. It seems very randomized, as it has happened even when connected to a very strong signal upon signing into the app.

I just had the same happen on Samsung Galaxy S7 Edge. I had saved my game like normal, but upon logging back in, I started at the world spawn point without any items or experience. However, as the person above me suggested, completely closing the app and logging in again put me back by my bed (where I had left the game previously) with all my items and levels.

Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-29863 due to the more general or descriptive summary.

Your votes, additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.

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This just happen to me today around 6pm PST I saved my account on my BED well lighted. and now I open it I Died and all my item is missing. can someone please restore my previous save  progress all my progress is gone and all the effort wasted! 

I’ve got pretty much the same problem. When I log back in the game of my world it’s fine, my items are still in the inventory, my spawn location is where I left it but then when I go back into the game after closing the app and been on another game the world spawn and items are reset and gone. It is randomised. Pls fix this I’ve tried everything 

This just happened to me in 1.19.63 on bedrock on the box. Can we either reopen this or make a new item? I am not sure if maybe now there is a stopgap to help this. A way to restore it.