The U.N. Human Rights Commission, meeting in Geneva, today rejected a British proposal, supported by the United States, to investigate alleged massive violations of human rights in Uganda.

Instead, according to informed diplomatic sources here, the 32-nation commission adopted a resolution simply to "continue to examine the situation" in Uganda.

The vote was 20 to 8 with four abstentions.

Britain and the United States voted against the resolution, according to the diplomatic informants, because, as one said, "This amounts to a decision not to face the problem. It means that the commission is not going to consider it until it meets again one year from now."

The commission's session is to end on March 11, and Uganda can be brought up again during the public debate on another agenda item. An American official pointed out, however, that the voting pattern in today's closed meeting is likely to be repeated in any open meeting, and no different result could be anticipated.

In addition to the Uganda situation, the commission took up in secret similar allegations involving Equatorial Guinea, Uruguay, Chile and South Korea. Although U.N. rules permit full-scale investigations of the countries named, no such action was taken on any of the cases, the sources said.