Only MQTT configurations in .things file not shown anymore in PaperUI

Thanks for the info. It was some kind of last resort… Have been struggling with this issue for weeks reading up in this community without any solution so far. Full microSD backup available :smiley: Finally registered today.

Based on update.log from April 10th 2021: SUCCESS: openHAB updated from 2.5.10 to 2.5.12

Image is up to date.
docker-compose:

version: '2.2'

# https://www.openhab.org/docs/installation/docker.html | https://hub.docker.com/r/openhab/openhab/
services:
  openhab:
    image: openhab/openhab:2.5.12
    network_mode: host
    volumes:
      - '/etc/localtime:/etc/localtime:ro'
      - '/etc/timezone:/etc/timezone:ro'
      - './openhab_addons:/openhab/addons'
      - './openhab_conf:/openhab/conf'
      - './openhab_userdata:/openhab/userdata'
    environment:
      OPENHAB_HTTP_PORT: '8080'
      OPENHAB_HTTPS_PORT: '8443'
      EXTRA_JAVA_OPTS: '-Duser.timezone=Europe/Berlin'
    restart: always

Stopped the old container, deleted it and created a new one. Added the addons.kar file just to be sure. Starting the container takes several retries:

...
2021-05-14 20:07:01.980 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Time zone set to 'Europe/Berlin'...
...
2021-05-14 20:08:54.117 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading model '0x_Schalter_Aussensteckdosen.rules'
2021-05-14 20:09:43.430 [INFO ] [ternal.dhcp.DHCPPacketListenerServer] - DHCP request packet listener online
2021-05-14 20:10:49.376 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Time zone set to 'Europe/Berlin'.
...
2021-05-14 20:15:23.479 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Time zone set to 'Europe/Berlin'.
...
2021-05-14 20:17:28.174 [INFO ] [ternal.dhcp.DHCPPacketListenerServer] - DHCP request packet listener online
2021-05-14 20:18:11.174 [INFO ] [.core.internal.i18n.I18nProviderImpl] - Time zone set to 'Europe/Berlin'.

UPDATE:
After reinstalling all addons the MQTT binding is finally working again. Thanks for your quick help!