I initially misunderstood this bug report about a nymph who was
polymorphed into a long worm while carrying a cursed figurine.
It wasn't about a long worm having inventory or about probing of
the worm's tail revealing that it had inventory, it was about the
message given when the cursed figurine activated itself. If that
happened while the head was out of view but at least one tail
segment was visible, the message about the new monster emerging
from the long worm's backpack implied that that pack was carried
by the tail segment.
Only give the emerge-from-backpack message when the worm's head
is visible. Likewise if a carried egg hatches.
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