External Application won't stay put

I’ve got RX 8 and 9 listed as external applications in the preferences. When I delete RX8 and 9 and choose RX10 Wavelab always reverts back the RX8 and 9 and removes RX10. I need to keep RX8 and 9 on my system…any thoughts? I’m running WL 11.2 (build 13) on a Mac Studio, M1 Ultra.