Problem while adding a new user with using subdirectory (nginx proxy pass)

[Bartosz Brodnicki]

version: '3.3'
services:
  stirling-pdf:
    container_name: stirling-pdf
    image: frooodle/s-pdf:latest
    ports:
      - '7700:8080'
    volumes:
      - /data/stirling-pdf/trainingData:/usr/share/tesseract-ocr/5/tessdata #Required for extra OCR languages
      - /data/stirling-pdf/configs:/configs
      - /data/stirling-pdf/customFiles:/customFiles/
      - /data/stirling-pdf/logs:/logs/
    environment:
      - DOCKER_ENABLE_SECURITY=true
      - SECURITY_ENABLELOGIN=true
      - SYSTEM_DEFAULTLOCALE=pl-PL
      - SYSTEM_ROOTURIPATH= /pdf

This work perfect with custom subdirectory like domain.com/pdf, but issue is when try add new user. When I add a new user path changes to domain.com/api/v1/user/admin/saveUser so its totally skip /pdf. I don't know if I'm doing something wrong, but currently the only solution is to remove rooturipath, add users using direct ip with port and after adding them again put docker with rooturipath /pdf.