Hi Pierre,
There's a thread about this issue on the dspace-tech list at:
https://groups.google.com/g/dspace-tech/c/lr7kfeLLEjgI just responded to that thread as well to let everyone know that I *think* I tracked down the issue. It appears a recent change in 7.x accidently filtered out a number of Jetty JARs from the DSpace codebase... and this resulted in the Handle Server not working properly. I *think* I've figured out a fix in this PR
https://github.com/DSpace/DSpace/pull/8498
However, it still needs more testing. If you are interested in helping test it out for us, please let us know or add in your comments on that PR.
Thanks,
Tim