Can't pick up Items and blocks that I held before I died

I've noticed that whenever I die. I come back to pick up my stuff and I could only pick up half my stuff. this happens when I have Immediate respawn on but might do the same with it off. It's really upsetting because once I died from a creeper explosion (Classic) and I had a Netherite sword. Then the glitch or bug happened and I couldn't pick it up and a bunch of other valuable things like diamonds T~T. I just ask that you super nice people at Mojang studios fix this fast so me, and possibly other people can still have fun. Thanks Mojang!

 

P.S. You guys are doing great on 1.17 update! Keep up the good work!