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CSE limited to 20 domains???
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I noticed that CSE works perfectly when there are up to 20 different domains/sites. But as soon as you add a 21st domain, or more, results drop from thousands to below 10.
CSE allows many records/URLs from the same site/domain, but the number of unique domains in one CSE is limited to 20, after that it goes to just a handful of results with decreased relevancy.

For example, this is one of our CSEs that includes 20 separate domains, and the results are plenty and relevant (about 18,000):
https://cse.google.com/cse?cof=FORID:0&cx=partner-pub-2806779683782082:5656265103#gsc.tab=0&gsc.q=cats

But as soon as we add a 21st domain, the results drop from 18,000 to one (not counting ads). 
Attached is a screenshot.

Can this be fixed please?
CSE FAQs state that we can include up to 5000 records, and nowhere it says we are limited to just 20. In our case it's very frustrating as we use Google CSE for a search engine that searches many sites in a narrow niche.
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