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e3ace39
(Get the code!)
I just checked CLISP as well and it says unbound; but the behavior differs in one regard with the others: if the symbol being imported had no home package, then it becomes constant and eq to itself.
So it seems like the evidence is fairly compelling that this hair-splitting behavior is not well-defined, and changing it would make SBCL agree with CCL but disagree with others.
As to (intern "BAR" (find-package "KEYWORD")) not doing the three actions automatically, it doesn't do them if the symbol was already imported without doing them, thereby returning a found symbol; all 5 other implementations agree with this as far as I can tell.