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To detect errors in conversion from Unicode to another text encoding, each mbstring conversion filter object maintains a count of 'bad' characters. After a conversion operation finishes, this count is checked to see if there was any error. The problem with CP50220 was that mbstring used a chain of two conversion filter objects. The 'bad character count' would be incremented on the second object in the chain, but this didn't do anything, as only the count on the first such object is ever checked. Fix this by implementing the conversion using a single conversion filter object, rather than a chain of two. This is possible because of the recent refactoring, which pulled out the needed logic for CP50220 conversion into a helper function.