Since we now know the reason, the solution should be quite simple. All you need to do is insert some characters between "search?" and "q=cache" to split this string apart, which will make Google's cached page "return to normal."
For the cache of the page mentioned above, copy the "cached page" URL into the address bar, then insert an "&" symbol in the middle of "search?q=cache," changing it to "search?&q=cache." After pressing Enter, you'll be able to see the long-awaited Google cached page again.