[Bug]: API ControlNet is not working, Working in webui

Nobody has claimed this yet.

### Checklist

- [X] The issue exists after disabling all extensions
- [X] The issue exists on a clean installation of webui
- [ ] The issue is caused by an extension, but I believe it is caused by a bug in the webui
- [X] The issue exists in the current version of the webui
- [X] The issue has not been reported before recently
- [ ] The issue has been reported before but has not been fixed yet

### What happened?

ControlNet API is not working, but in webui ControlNet is working properly.

### Steps to reproduce the problem

Go to http://127.0.0.1:7860/docs#/default/img2imgapi_sdapi_v1_img2img_post

{
"alwayson_scripts": {
"API payload": {
"args": []
},
"Comments": {
"args": []
},
"ControlNet": {
"args": [
{
"batch_image_dir": "",
"batch_input_gallery": [],
"batch_mask_dir": "",
"batch_mask_gallery": [],
"control_mode": "Balanced",
"enabled": true,
"generated_image": null,
"guidance_end": 1,
"guidance_start": 0,
"hr_option": "Both",
"image": null,
"input_mode": "simple",
"mask_image": null,
"model": "diffusion_pytorch_model [458b7f40]",
"module": "openpose_full",
"pixel_perfect": true,
"processor_res": 512,
"resize_mode": "Crop and Resize",
"save_detected_map": true,
"threshold_a": 0.5,
"threshold_b": 0.5,
"use_preview_as_input": false,
"weight": 1
},
{
"batch_image_dir": "",
"batch_input_gallery": [],
"batch_mask_dir": "",
"batch_mask_gallery": [],
"control_mode": "Balanced",
"enabled": false,
"generated_image": null,
"guidance_end": 1,
"guidance_start": 0,
"hr_option": "Both",
"image": null,
"input_mode": "simple",
"mask_image": null,
"model": "None",
"module": "None",
"pixel_perfect": false,
"processor_res": -1,
"resize_mode": "Crop and Resize",
"save_detected_map": true,
"threshold_a": -1,
"threshold_b": -1,
"use_preview_as_input": false,
"weight": 1
},
{
"batch_image_dir": "",
"batch_input_gallery": [],
"batch_mask_dir": "",
"batch_mask_gallery": [],
"control_mode": "Balanced",
"enabled": false,
"generated_image": null,
"guidance_end": 1,
"guidance_start": 0,
"hr_option": "Both",
"image": null,
"input_mode": "simple",
"mask_image": null,
"model": "None",
"module": "None",
"pixel_perfect": false,
"processor_res": -1,
"resize_mode": "Crop and Resize",
"save_detected_map": true,
"threshold_a": -1,
"threshold_b": -1,
"use_preview_as_input": false,
"weight": 1
}
]
},
"DynamicThresholding (CFG-Fix) Integrated": {
"args": [
false,
7,
1,
"Constant",
0,
"Constant",
0,
1,
"enable",
"MEAN",
"AD",
1
]
},
"Extra options": {
"args": []
},
"FreeU Integrated": {
"args": [
false,
1.01,
1.02,
0.99,
0.95
]
},
"HyperTile Integrated": {
"args": [
false,
256,
2,
0,
false
]
},
"Kohya HRFix Integrated": {
"args": [
false,
3,
2,
0,
0.35,
true,
"bicubic",
"bicubic"
]
},
"LatentModifier Integrated": {
"args": [
false,
0,
"anisotropic",
0,
"reinhard",
100,
0,
"subtract",
0,
0,
"gaussian",
"add",
0,
100,
127,
0,
"hard_clamp",
5,
0,
"None",
"None"
]
},
"MultiDiffusion Integrated": {
"args": [
false,
"MultiDiffusion",
768,
768,
64,
4
]
},
"Never OOM Integrated": {
"args": [
false,
false
]
},
"Refiner": {
"args": [
false,
"",
0.8
]
},
"Seed": {
"args": [
1102242279,
false,
-1,
0,
0,
0
]
},
"Segment Anything": {
"args": [
false,
false,
0,
null,
[],
0,
false,
[],
[],
false,
0,
1,
false,
false,
0,
null,
[],
-2,
false,
[],
false,
0,
null,
null
]
},
"SelfAttentionGuidance Integrated": {
"args": [
false,
0.5,
2
]
},
"Soft Inpainting": {
"args": [
false,
1,
0.5,
4,
0,
0.5,
2
]
},
"StyleAlign Integrated": {
"args": [
false
]
}
},
"batch_size": 1,
"cfg_scale": 7,
"comments": {},
"denoising_strength": 0.75,
"disable_extra_networks": false,
"do_not_save_grid": false,
"do_not_save_samples": false,
"height": 683,
"image_cfg_scale": 1.5,
"init_images": [
"base64image placeholder"
],
"initial_noise_multiplier": 1,
"inpaint_full_res": 0,
"inpaint_full_res_padding": 32,
"inpainting_fill": 1,
"inpainting_mask_invert": 0,
"mask_blur": "base64image placeholder",
"mask_blur": 4,
"mask_blur_x": 4,
"mask_blur_y": 4,
"mask_round": true,
"n_iter": 1,
"negative_prompt": "ugly, deformed, noisy, blurry, distorted, nude, nsfw, out of focus, bad anatomy, extra limbs, poorly drawn face, poorly drawn hands, missing fingers, disfigured, ugly, bad, immature, cartoon, anime, 3d, painting, b&w",
"override_settings": {},
"override_settings_restore_afterwards": true,
"prompt": "group of people waring military costume, masterpiece hyper realism 8k, HDR, highly detailed, sharp focus, looking at the camera",
"resize_mode": 0,
"restore_faces": false,
"s_churn": 0,
"s_min_uncond": 0,
"s_noise": 1,
"s_tmax": null,
"s_tmin": 0,
"sampler_name": "Euler a",
"script_args": [],
"script_name": null,
"seed": 1102242279,
"seed_enable_extras": true,
"seed_resize_from_h": -1,
"seed_resize_from_w": -1,
"steps": 30,
"styles": [],
"subseed": -1,
"subseed_strength": 0,
"tiling": false,
"width": 1024
}

### What should have happened?

ControlNet API is not working

### What browsers do you use to access the UI ?

Google Chrome

### Sysinfo

-

### Console logs

```Shell
ControlNet openpose is working fine with webui, but when I try from API same model and setting it is giving following error.

*** Error running postprocess_batch_list: D:\Forge\webui\extensions-builtin\sd_forge_controlnet\scripts\controlnet.pys]
Traceback (most recent call last):
File "D:\Forge\webui\modules\scripts.py", line 859, in postprocess_batch_list
script.postprocess_batch_list(p, pp, *script_args, **kwargs)
File "D:\Forge\system\python\lib\site-packages\torch\utils\_contextlib.py", line 115, in decorate_context
return func(*args, **kwargs)
File "D:\Forge\webui\extensions-builtin\sd_forge_controlnet\scripts\controlnet.py", line 561, in postprocess_batch_list
self.process_unit_after_every_sampling(p, unit, self.current_params[i], pp, *args, **kwargs)
KeyError: 0

---
Total progress: 100%|██████████████████████████████████████████████████████████████████| 23/23 [00:05<00:00, 4.51it/s]
Total progress: 100%|██████████████████████████████████████████████████████████████████| 23/23 [00:05<00:00, 4.63it/s]
```

### Additional information

-

Start with the img2img API endpoint in the issue and reproduce the request with the supplied ControlNet payload. Trace the failure from modules/scripts.py:859 into extensions-builtin/sd_forge_controlnet/scripts/controlnet.py:561, where postprocess_batch_list raises KeyError: 0. Done means the same ControlNet configuration works through the API without this error, while webui behavior remains unchanged.

Written by the indexing model from the issue text.