Multi-word search is broken when used with OR

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OR breaks multi-word searches

https://github.com/search?q=abc+hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg&type=issues
abc hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg is:issue
returns nothing as expected ✅
as hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg does not appear in any issues

but for some reason adding OR causes it to return erroneous results
https://github.com/search?q=abc+hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg+OR+hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg++is%3Aissue&type=issues
abc hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg OR hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg is:issue
returns 264 thousand erroneous results 🐛

adding abc again causes 0 results to return
https://github.com/search?q=abc+hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg+OR+abc+hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg+is%3Aissue&type=issues
abc hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg OR abc hfgjhfdlkdfgldfjkgbkdlfjgbkjdfgfdg is:issue
zero results returned as expected ✅

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