While running down migrations that were created as a result from generating a custom content block type, 'def change' doesn't seem to be creating a 'down' migration. Perhaps it doesn't know what to do with the call to 'create_content_table'. I am hopeful that is the problem and not something with the latest ActiveRecord code.
In any case, when a migration is complex enough that it does not know how to create a 'down' migration from the 'up' syntax in the 'def change' method block, it is required to revert back to the old style, specifying 'def self.up' and 'def self.down' method blocks:
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