Thanks. Submitting bug report for Tie::File. (Upd: CPAN RT bug #39196 )

But the result appears to be an off-by-one in the module's implementation of the EXTEND.

It's not an off-by-one error, at least not on the module's behalf.
EXTEND is used to expand the internal buffer.
STORESIZE is used to actually change the visible size of the array.
Tie::File incorrectly treats EXTEND as STORESIZE.

In reply to Re^2: Tie::File - sorting array adds empty lines by ikegami
in thread Tie::File - sorting array adds empty lines by svenXY

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