Seems the Midi Utility section is empty, but the plugins are there. Poking around, (and with zero lv2 plugin knowledge!) i’m wondering whether theres a mismatch with the plugin .ttl files where they state: lv2:MIDIPlugin type that’s not being registered by mod-ui???
Happy to be corrected, even happier for a fix 
but keen to populate that Midi Utiliy section!! Modep is worth it for the midi ultities alone! Aware you can do a search so all is not lost!
To add, running localhost/effect/list shows the MIDI filters Category[]. i.e. empty.