It's defined here that .net 6.0 should use version 7.0.0 of this dependency, but the installation of .net 6.0 only supports up to 6.0.0. The problem might be fixed by having a separate package reference for .net 6.0.
I feel like a similar issue would also occur for .NET Standard 2.1, but I don't know what dependency to use for that since I haven't tested it.
This issue is similar to the resolved issue #99. From what I've seen the problem with loading the System.Drawing.Common in .net 6.0 seems to be caused by the Base project at line 52: https://github.com/xarial/xcad/blob/dev/src/Base/Base.csproj#L52
It's defined here that .net 6.0 should use version
7.0.0of this dependency, but the installation of .net 6.0 only supports up to6.0.0. The problem might be fixed by having a separate package reference for .net 6.0. I feel like a similar issue would also occur for .NET Standard 2.1, but I don't know what dependency to use for that since I haven't tested it.