“macOS Mojave 10.14.6 + vs for mac 2017 + MonoFramework 5.18 + MonoGame 3.7.1 + Pipeline.MacOS” Development environment test passed. Do not use vs for mac 2019 and close auto update and do not update “visual studio for mac 8.x”!
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Compile need setting Visual Studio > Preferences > Projects > .Net Runtimes > mono 5.18.x is default