Non-ascii rule issue

Within a ruleset I have two rules that are failing (invalid/unsupported error) and they are the only two lines that contain non-ascii characters. These two lines however are accepted on other sets of hashes I've tried, so (assuming that non-ascii is the reason for the error), what circumstances dictate whether hashcat will allow them or not? I couldn't find anything in the wiki about this. 

Thanks.

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