Multiple Items gone missing over past days

[caviive]

I'm glad I'm used to making screenshots of my inventory at this point.

IGN: caviive
Item Names:
Bookbag "Witch" (I think was the name) (First Screenshot, offhand-slot // Second Screenshot, First Hotbar-slot) *
Bag "Randoseru Black" (First Screenshot, First Hotbar-slot) *
Plushie "Sleepy Pika" (Second Screenshot, 8th Inventory Slot) *
Kanna Horns (Second Screenshot, 18th Inventory Slot) *
Table Set "Vintage Tea" (Second Screenshot, 27th Inventory Slot) +

* Glitched away whilst in offhand, due to School Planner or other Item
+ Accidentally broke in creative mode