The answer
The only kind of bread that is permitted to enter the sanctuary is the Host which is the offering of bread which the priest prays over in the Mass to consecrate it in order to transubstantiate it for the believers to receive in the Communion.
If any other offering of bread should enter the sanctuary, that is a clear mistake. Or to put it more precisely, it is an even greater mistake if the plate of this unconsecrated bread is placed on the altar. The laws of the Church have defined what may be placed on the altar, since it is not an ordinary table !
The plate of the unconsecrated bread is to be placed outside the sanctuary, in a suitable place, since the sign of the cross is to be made over it outside the sanctuary. Then one is chosen to be consecrated, outside the sanctuary before the offertory is being presented.
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Thrice-Blessed Pope Shenouda III of Blessed Memory