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I can think of some more examples; (and I guess that there are still even more): fehlen - fehlte - gefehlt be-/empfehlen - be-/empfahl - be-/empfohlen fehlen comes via French from Latin fallere. be-/empfehlen is unrelated and inherited from Germanic. bergen - barg - geborgen beherbergen - beherbergte - beherbergt beherbergen is derived from ...
This is quite rare indeed. There are certainly similar examples, but at the moment I don't have any that come to mind. On the above: entgleiten is being handled like gleiten as they have a similar definition. begleiten follows the word leiten in terms of grammar.
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