MacOS Catalina 10.15.6 Logic Pro 10.6.2
I just installed Komplete 13, so have the latest versions as of March 21, 2022.
Everything shows up in the plugin menu EXCEPT Massive X. In Logic's plug-in manager, the entry for Massive X says "not authorized". Massive works fine as do all the other NI plugins.
What's also strange is that in the Applications/Native_Instruments/Massive_X folder, there is no stand-alone version either, just a Documentation folder (but there are stand-alone versions for all the other instruments including Massive).