In 'luaV_finishset', there is an update on a table that is a field on
another table. If the first table is the same as the one with the field
(e.g., after 't.__newindex = t'), the update can change the value on
that field (if the field being updated is '__newindex' itself). After
that, the barrier is called with the table stored in that field, which
is not the correct table anymore.
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