After Beta I can't Play Alpha again

Hello, since I couldn't open a game in the beta version, I went back to the alpha version. Beta version uninstalled and Alpha version installed. Cache and data cleared. Signed in to Minecraft on Windows and started a new game as the beta destroyed my old game. Minecraft has now become extremely slow and after saving, I cannot return to the new game. I use an 8 inch Huawei M5. Before I wanted to test the beta, everything had worked. it ran smoothly, smoothly and very quickly. I uploaded a screenshot video to Google Drive, which should clarify any problems (Link upstairs). The last few seconds of the video are also important. The error message appears when I try to open the last game again (there shows: internet connection?). Oh yes, restarting the tablet doesn't change anything.

 How can I play again now? 😭😭😭😭

 Video with my Problem (to big for Upload). See also the end of them:

 https://drive.google.com/file/d/1rMLD2WsxvOxnDm_CU8SZ7Ywidt7zx1OA/view?usp=drivesdk