Not allowed to connect to Mysql error in docker

From time to time i receive this error while running the official mysql image in docker:

An exception occured in driver: SQLSTATE[HY000] [1130] Host ‘’ is
not allowed to connect to this MySQL server

The reason for this is not quite clear yet but i usually resolve it like described here.
Note that all data stored in the project will be lost!
So this error is quite annyoing but luckily i work on fixtures so i can restore data easily.
These steps let me connect to the mysql container again, at least.

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