Sometimes you have a bug in your config and than you have to delete some false fuzzy hashes. This is possible with the following command and the hashes shown in the rspamd log. It is not possible for the short hashes in the symbols.
rspamc -f 11 fuzzy_delhash fd8e4df1dac169526aa92d96dac9f2f149bf3e0c3d8801bd25948af4909a47690a96d41a61c81943f143b2de16498eb52bbc588b2f3ab7cd51f2caced11c94e5