It clearly is a bug, and I suggest reporting it with perlbug. For what it's worth the latest development perl hits an assertion even with a shorter form:

  zen% ./perl -e '*@=1'
  Assertion !((((dstr)->sv_flags & (0x00004000|0x00008000)) == 0x00008
+000) && (((dstr)->sv_flags & 0xff) == SVt_PVGV || ((dstr)->sv_flags &
+ 0xff) == SVt_PVLV)) failed: file "sv.c", line 3393 at -e line 1.
  zen%
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Hugo