PKP PN Plugin Setting error

Dear @asmecher
the “test title” originates from ui-library/FieldArchivingPn.vue at d41c26eed44a9a3c2d35d87b8a8b297567e05532 · pkp/ui-library · GitHub
The Failed Ajax request or invalid JSON returned is because the plnplugin breaks all settings-plugin-grid. Let me add that my plugin settings page doesn’t load on my production site. So once I rename the folder /plugins/generic/pln to e.g. capital letters, my plugin-settings pages load again. Just that plnplugin is then considered not to be installed. It’s similar to this post PKP PLN plugin OJS 3 - #40 by Eldhelion
Any ideas?

OJS 3.2.1.3