Sprites Invisible after updating sprite sheet

Hello. I Created a sprite sheet and sliced it. I updated the sprite sheet keeping it the same size but adding new sprites. Saved it to overwriting the old one and re-sliced the image. When viewing the sprites in the project view by clicking the little expansion arrow on the sprite sheet the new sprites are invisible in the list of tiles created from the slicing. I can still add them to a tile pallet and they show up in the scene. It's a pain in the butt to try and add these sprites to a tile rule when you can't see which one you are using. They appear invisible in the rule inspector as well. I have tried right clicking the sheet and selecting refresh and closing unity and opening it back up. Thanks!