I think the reason realtime messages are ignored when receiving is that, by their nature, there are *a lot* of them and they come *really quickly*. Based Pd's architecture, I can imagine a flood of realtime messages might make the GUI unresponsive, so they are left off. I might be wrong on this.
actually it would be cool if [midiin] would really output all MIDI
messages!
maybe... try and open an issue on github, or a Pull Request (PR) and make acase for that ;)[midiclkin] doesn't output any clock messages while [midirealtimein] doesso it's apparently broken.
It is broken, and instead of being fixed, it is actually being removed, sothe idea is to keep using [midirealtimein] for that.