I found a bug in the default firmware.
The problem is with the MT1300.
The application called /usr/bin/gl_ble_ubus cannot start because it lacks dependencies.
The problem is a dependency named: libubus.so
Below is the exact log of the problem:
Error loading shared library libubus.so: No such file or directory (needed by /usr/bin/gl_ble_ubus)
I solved this problem at home in the following way.
ln -s libubus.so.20210603 libubus.so
However, this is just a workaround. I am asking for a permanent repair.