Do appreciate the help! but it did not solve anything.
When I switched out that code and tested it with PhP 5.6 running, the mod stopped fetching external titles, and the regular URL posted with no conversion to title.
Same result with PhP 7 running, whether I had the other mod (auto tagger), on or off - posts were no longer invisible, but the regular URL posted with no conversion to title.
i.e. the replaced code did eliminate the weird, invisible post behavior, but it also stopped the external title fetcher from fetching external titles, whether in PhP 5.6 or 7.
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