Hi,
Without log file it very hard to trace the issue as this is not re-producible on our side.
Are you sure that pgadmin4.log file is empty?
Can you try again changing the logging configuration, add below config option in "config_local.py" (which is in pgAdmin4 installation directory),
FILE_LOG_LEVEL = logging.DEBUG
restart pgAdmin4 and re-produce the issue, check the log file for any error.