My things disappeared after I suffocated because I threw an Ender Pearl

After I killed an Enderman and got its ender pearl, I tried to use it. First and second try there was no issue but the third time I throw the ender pearl the problem arises. First I landed safely but after a few second I got trap in the stone and died due to suffocation but when get back to get my things back it just disappeared even. It should have been push to the nearest air pocket but it just disappeared.