Bug that made me depressed

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I was in mining area when i wore my armor and it dissappeared.
My armor was Titan Helmet, Round Table Knight Chestplate, Titan leg guards and Round Table Knight Shoes. I hope this gets fixed bc i worked hard getting those (Can u guys also please return a part of my armor? The titan helmet part of my armor was given by my brother and the leg guards by my freind)
Here's a screenshot of me now (I still have extra diamond armor from the fragments):

please fix this