When I use the REST API to add a scan target, the scan process always ends quickly. I wonder what the problem is

[ShiZiLaiXi]

API Interface：http://10.10.18.197:7331/scans
[parameter]：{
"url" : “http://10.10.18.134”,
"http" : {
"user_agent" : "Arachni/v2.0dev",
"request_timeout" : 10000,
"request_redirect_limit" : 5,
"request_concurrency" : 20,
"request_queue_size" : 100,
"request_headers" : {},
"response_max_size" : 500000,
"cookies" : {}
},
"audit" : {
"parameter_values" : true,
"exclude_vector_patterns" : [],
"include_vector_patterns" : [],
"link_templates" : []
},
"input" : {
"values" : {},
"default_values" : {
"(?i-mx:name)" : "arachni_name",
"(?i-mx:user)" : "arachni_user",
"(?i-mx:usr)" : "arachni_user",
"(?i-mx:pass)" : "5543!%arachni_secret",
"(?i-mx:txt)" : "arachni_text",
"(?i-mx:num)" : "132",
"(?i-mx:amount)" : "100",
"(?i-mx:mail)" : "arachni@email.gr",
"(?i-mx:account)" : "12",
"(?i-mx:id)" : "1"
},
"without_defaults" : false,
"force" : false
},
"browser_cluster" : {
"wait_for_elements" : {},
"pool_size" : 6,
"job_timeout" : 25,
"worker_time_to_live" : 100,
"ignore_images" : false,
"screen_width" : 1600,
"screen_height" : 1200
},
"scope" : {
"redundant_path_patterns" : {},
"dom_depth_limit" : 5,
"exclude_path_patterns" : [],
"exclude_content_patterns" : [],
"include_path_patterns" : [],
"restrict_paths" : [],
"extend_paths" : [],
"url_rewrites" : {}
},
"session" : {},
"checks" : [],
"platforms" : [],
"plugins" : {},
"no_fingerprinting" : false,
"authorized_by" : null
}

Result:
"status": "done",
"busy": false,
"seed": "99eff1fefd408aaee148a914948529b7",
"statistics": {
"http": {
"request_count": 4,
"response_count": 4,
"time_out_count": 0,
"total_responses_per_second": 148.75701059250324,
"burst_response_time_sum": 0,
"burst_response_count": 0,
"burst_responses_per_second": 0,
"burst_average_response_time": 0,
"total_average_response_time": 0.00275025,
"max_concurrency": 20,
"original_max_concurrency": 20
},
"browser_cluster": {
"seconds_per_job": 2.962962962962963,
"total_job_time": 80,
"queued_job_count": 27,
"completed_job_count": 27,
"time_out_count": 0
},
"runtime": 24.787512074,
"found_pages": 26,
"audited_pages": 26,
"current_page": "http://10.10.18.134/v1/produce/logo?_t=1660878969&id=0"
},
"errors": [],
"messages": [
"Waiting for the plugins to finish."
],
"issues": [],

When I added a scan target to the Web page, the scan completed normally

[ShiZiLaiXi]

What plug-in does "Waiting for the plugins to finish "mean