So I don't know if there was a known issue, but I had a problem with the RC5 of 7.2.0 kernel. My NetworkManager crashed and I had no network. However the following ones were fine including the final kernel.
Now onto the 7.3.0 series which is off to a promising start. The alpha1 booted fast. I'll see how the RCs go.
I have released the stable long-term kernel 5.10.270 with improved NFTables support for X1000 and e5500 machines (X5000/20, X5000/40, Mirari, and QEMU VMs).