When booting with 5.14.12-200 kernel a blank screen is shown. After entering the correct passphrase for LUKS Solus does start. It works when selecting the previous kernel (5.14.10).
It probably is caused by changing CONFIG_FB_SIMPLE from y(es) to m(odule) [ https://dev.getsol.us/R3571:031a869e1f5154aa44ec5a7febb82dffe721ffcb ].