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I'm not really concerned about that.Is it being reported that the newest vaccine version has only been tested on mice. I’m vaccinated and boosted. Is anyone concerned that there have been no human trials?

Why the New COVID-19 Booster Was Authorized Before Testing on People
New COVID-19 boosters could be authorized by the FDA before full data from human trials are in because of past data on similar vaccines. With the COVID-19 vaccines, there is already a long track record of safety to support the new boosters.

Science | AAAS

From the Science article:
The companies say clinical trials for the BA.4/BA.5 vaccines will begin next month; they need clinical data both for full approval of the vaccines—their recent submissions are only for emergency use authorization—and to help develop future updates. Presumably they will measure recipients’ antibody levels, but not the vaccine’s efficacy against infection or severe disease. Such trials are very expensive and were not done for the BA.1 shot either.