Web options neither work nor persist in sist2-admin

[acotor]

Device Information (please complete the following information):

• OS: [Qnap QTS 5.0.1.2376]
• Deployment: [Docker Standalone 20.10.17-qnap10, Portainer CE 2.18.4]
• Browser (if relevant): [MS Edge, Firefox]
• SIST2 Version: [v3.1.4]
• Elasticsearch Version (if relevant) : 7.17.9

Command with arguments

version: "3"

services:
  elasticsearch:
    image: elasticsearch:7.17.9
    restart: unless-stopped
    environment:
      - "discovery.type=single-node"
      - "ES_JAVA_OPTS=-Xms2g -Xmx2g"
      - TZ=Asia/Shanghai
    volumes:
      - esdata:/usr/share/elasticsearch/data
    networks:
      network1:
        ipv4_address: 10.0.6.36
  sist2-admin:
    image: simon987/sist2:3.1.4-x64-linux
    restart: unless-stopped
    volumes:
      - /share/SRV/sist2/sist2-admin-data/:/sist2-admin/
      - /share/Archive/DOCLIB:/host
    environment:
      - TZ=Asia/Shanghai
    #ports:
      #- 4090:4090 # sist2
      #- 8080:8080 # sist2-admin
    working_dir: /root/sist2-admin/
    entrypoint: python3 /root/sist2-admin/sist2_admin/app.py
    networks:
      network1:
        ipv4_address: 10.0.6.35
networks:
  network1:
    name: bridge1
    external: true
volumes:
  esdata:

Describe the bug Any change to the Web options does not take effects, and was set to default when I enter in the Frontend setting page again. Including the UI Language, Tagline in navbar, Basic auth, Auth0 options.

Steps To Reproduce

1. Start the stack in portainer.
2. Go to sist2-admin page, then create jobs and start indexing, or use the previous jobs and indexes.
3. Go to a frontend settings page like default, or create newfrontend, select indexes, then make changes to basic auth.
4. Start the frontend.
5. Go to the frontend 10.0.6.35:8080, see no basic auth.
6. Go to sist2-admin page, then go back to frontend settings page default or newfront, see the basic auth is empty.

Expected behavior Any change to the Web options is expected to persist.

Actual Behavior Web options not work.

Screenshots none.

Additional context Indexing and frontend searching are functioning well. And many other containers and stacks work just fine.