On my Xbox series X I updated Minecraft and upon opening the game saw all my worlds I hadn't opened as of the past couple days were not working. I've looked up multiple ways to fix this but seem to find older videos with different situations compared to mine. It doesn't even let me go into edit without telling me the same message. Is there are way to fix this?
This issue is being tracked at MCPE-197900. It should be fixed when 1.21.100 is released.