Probably no known problems because 8.0.5 has been desupported on Solaris 8. 8.1.7 is the last 8i version still supported/certified on Solaris 8.

Of course, it doesn't mean 8.0.5 won't run on Solaris 8. You can review your 8.0.5 install guide to see what OS's were supported. If SunOS 2.8/Solaris 8 is listed, then do whats you gots to do.