In the case where a priest unknowingly used a non-wheat host (like a rice “host”,) the consecration would NOT take place. A rice host is invalid matter.As I understand it (somebody correct me if this is wrong), if it were a genuine mistake on the part of the priest (he thought they were wheat hosts) then the mistake might be covered as long as he didn’t make a practice out of it.
Was it a valid consecration if the priest used leavened bread? | Catholic Answers
The link you posted referred to using leavened bread. Leavened bread is not invalid matter, but rather unlawful matter, at least for Latin Catholics. The consecration would still take place.
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