Bedrock worlds deleted after downloading 10 years map

So I was celebrating the anniversary of Minecraft and downloaded the 10 years map on my Samsung tablet. I explored in it and left. The next day, I decided to play in a world and when I went to the world list, it was empty except for the 10 years map. I tried different things, like uninstalling and reinstalling, but that just showed me worlds from a LONG time ago. Then, I changed my storage to external. Didn't work. Could you guys fix this or tell me a way to get my worlds back? Thanks, and bye.