On the contrary, it is the official teaching of at least this U.S. Catholic diocese:
However, the Directory reminds us that “…in certain circumstances, by way of exception and under certain conditions, access to these sacraments (Eucharist, Reconciliation and Anointing of the Sick) may be permitted or even commended for Christians of other churches and ecclesial communities.” (9) This may always be done if a Christian is in danger of death (cf. section IV, below, and canon 844.4). However, Eucharist may also be given to other Christians if there is, in the judgment of the diocesan bishop or episcopal conference, some other “grave necessity” or “grave and pressing need.” (10) Consequently, just as it is inappropriate to issue a general invitation to Christians who are not Catholic to share in Holy Communion, it is equally inappropriate to make a general statement indiscriminately barring all other Christians from sharing in the sacrament. Such a total prohibition would be more limiting than the norms of the Directory and the 1996 statement of the National Conference of Catholic Bishops now published in all participation materials.
However, as mentioned above, there are occasions when sacramental sharing with other Christians is possible. Indeed, Pope John Paul II remarks that “it is a source of joy” that Catholic ministers, in particular cases, can administer sacraments to Christians with whom Catholics do not share full ecclesial communion.
•The person requesting the sacrament must be validly baptized. Baptism is valid when water is poured or the person is immersed and the trinitarian formula is used. For example, valid baptism is presumed for Episcopalians, Lutherans, Presbyterians and Methodists. (21)
•The person must manifest the faith which the Catholic Church professes in the sacrament. As a minimum for Eucharistic sharing, the person must believe that in receiving the Eucharist we receive the body and blood of Christ. In some communions this is standard dogma; for example, Episcopalians and Lutherans can be presumed to believe in the real presence. For members of other communions there may be need for some further discussion concerning their belief in the Eucharist.
•The person must ask for the sacrament freely. The request must have been initiated by the person seeking Eucharistic communion.
•The person must be unable to have recourse for the sacrament to a minister of his or her own community. This condition is met when gaining access to one’s own minister poses a reasonable physical, moral or psychological difficulty, or causes serious inconvenience for the minister or recipient.
•The person must be properly disposed to receive the sacrament. As noted above “proper disposition” is the same as required for Catholics, i.e., not conscious of serious sin (see canon 916). “Being properly disposed means being in a good relationship with God, or if not, taking whatever steps are necessary to return to a good relationship with God.” (22)
In light of the above canonical norms and pastoral reflections, the following situations are examples–not an exhaustive list-- of occasions, other than danger of death, when a “grave necessity” may be discerned and Eucharist may be shared with Episcopal or Protestant Christians if all the conditions are met: