Yep, my son had this with group projects. The first one was in 2020 when he just started Uni and the Uni was virtually closed "due to covid". A couple in his group were Chinese and still living in China - so impossible for physical meet up. The ones actually at Uni tried their best to facilitate online teams meetings, suggesting early morning or late night meeting times but the couple of Chinese people agreed the virtual meetings but never turned up. In the end, their contributions was Zero, and son and the others just did it themselves. Likewise, when they asked for advice from the lecturer, he just said the same "it's life, you have to cope with it". I know they did give feedback to the lecturer that the two overseas students had done nothing, but don't know about marks.
Last year, similar happened, even though all/most students were on campus, on a group project, it was only him and one other who did anything at all - the others came to the odd meeting, attended the odd virtual meeting, agreed to do the work they were allocated, but ended up producing nothing. So, instead of a group of six, it was only two of them that did the project. Likewise, they made it clear to the lecturer who had done which aspects of the project and who had contributed nothing. Son and his friend basically spent all Easter holidays working on the project on their own, but also ensured that when it came to the presentation, it was only the two of them who presented it - the others tried to muscle in, but weren't "copied into" the end presentation until after it happened!
Sadly, the lecturers are right to a point, in real life, people make varying contributions to group projects, even in workplaces, and you can't go crying to your bosses when someone isn't pulling their weight. You've got to step up, make the project as much of a success as possible, but also, make it clear as to who's done what and who hasn't, and let the "boss" deal with it.
Pretty sure lecturers realise that there are group members who don't perform. But the remaining members have to pick up the slack, as their marks depend on it, and you just have to hope that the lecturers mark the real contributors more favourably and the lesser contributors less favourably, but if they don't, not much you can do. You've always just got to do your best, sometimes it's not fair, but life isn't fair.