Every time I exit to menu and come back, any blocks I have recently placed have disappeared and are missing from my inventory, stone cutters replaced with furnaces, smooth sandstone replaced with regular sandstone, animals not respawning

Put the summary of the bug you're having here

What I expected to happen was...:
when I exited to menu, I thought everything I made would be saved

What really happened was...:
All recent blocks/items that I had placed disappeared and were not in my inventory, all stone utters replaced with two furnaces(one where it was, the other in inventory), and any smooth sandstone I placed was replaced with regular sandstone

Steps to Reproduce:
1. Place stone cutter, place smooth sandstone, place blocks, kill animals
2. Exit to menu
3. Resume map/world
4. Everything gone/animals not respawned...