On Demand Resources does not show an error

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I am integrating On Demand Resources into my Unity game. The resources install without any problems if the internet connection is stable: all resources are installed. While testing various scenarios without an internet connection, I encountered the following problem: if I turn off the internet during installation, I don't get any error messages, but if I turn the internet back on, the download no longer continues (and I still don't get an error). If I reopen the application with a stable internet connection, the download will always be at 0%. Please tell me what I am doing wrong.

#import "Foundation/Foundation.h"
#if ENABLE_IOS_ON_DEMAND_RESOURCES
    #import "Foundation/NSBundle.h"
#endif
#include <string.h> 


struct CustomOnDemandResourcesRequestData;

typedef void (*CustomOnDemandResourcesRequestCompleteHandler)(struct CustomOnDemandResourcesRequestData* handler, const char* error);


#if ENABLE_IOS_ON_DEMAND_RESOURCES


struct CustomOnDemandResourcesRequestData
{
    NSBundleResourceRequest* request;
};


extern "C" CustomOnDemandResourcesRequestData* CustomOnDemandResourcesCreateRequest(const char* const* tags, int tagCount, CustomOnDemandResourcesRequestCompleteHandler handler)
{
    NSMutableArray* tagArray = [NSMutableArray array];
    for (int i = 0; i < tagCount; i++) {
        const char* tag = tags[i];
        if (tag != NULL) {
            [tagArray addObject:[NSString stringWithUTF8String:tag]];
        }
    }

    NSSet* tagSet = [NSSet setWithArray:tagArray];
    CustomOnDemandResourcesRequestData* data = new CustomOnDemandResourcesRequestData();
    data->request = [[NSBundleResourceRequest alloc] initWithTags:tagSet];
    
    [data->request beginAccessingResourcesWithCompletionHandler:^(NSError* error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            const char* errorMessage = error ? [[error localizedDescription] UTF8String] : NULL;
            handler(data, errorMessage);
        });
    }];
    
    return data;
}

extern "C" void CustomOnDemandResourcesRelease(CustomOnDemandResourcesRequestData* data)
{
    [data->request endAccessingResources];
    delete data;
}

extern "C" float CustomOnDemandResourcesGetProgress(CustomOnDemandResourcesRequestData* data)
{
    return data->request.progress.fractionCompleted;
}

extern "C" float CustomOnDemandResourcesGetLoadingPriority(CustomOnDemandResourcesRequestData* data)
{
    float priority = (float)data->request.loadingPriority;
    return priority;
}

extern "C" void CustomOnDemandResourcesSetLoadingPriority(CustomOnDemandResourcesRequestData* data, float priority)
{
    if (priority < 0.0f)
        priority = 0.0f;

    if (priority > 1.0f)
        data->request.loadingPriority = NSBundleResourceRequestLoadingPriorityUrgent;
    else
        data->request.loadingPriority = (double)priority;
}

extern "C" const char* CustomOnDemandResourcesGetResourcePath(CustomOnDemandResourcesRequestData * data, const char* resource)
{
    NSString* resourceStr = [NSString stringWithUTF8String: resource];
    NSString* path = [[data->request bundle] pathForResource: resourceStr ofType: nil];
    
    if (path == nil) {
        return NULL; // или другое значение по умолчанию
    }
    
    const char* result = strdup([path UTF8String]); // копируем строку
    return result; // в C# нужно будет освободить память
}

extern "C" void CustomOnDemandResourcesFreeString(const char* str) {
    free((void*)str);
}

#else // ENABLE_IOS_ON_DEMAND_RESOURCES


struct CustomOnDemandResourcesRequestData
{
};


extern "C" CustomOnDemandResourcesRequestData* CustomOnDemandResourcesCreateRequest(const char* const* tags, int tagCount, CustomOnDemandResourcesRequestCompleteHandler handler)
{
    CustomOnDemandResourcesRequestData* data = new CustomOnDemandResourcesRequestData();
    if (handler)
        handler(handlerData, NULL);
    return data;
}

extern "C" void CustomOnDemandResourcesRelease(CustomOnDemandResourcesRequestData* data)
{
    delete data;
}

extern "C" float CustomOnDemandResourcesGetProgress(CustomOnDemandResourcesRequestData* data)
{
    return 0.0f;
}

extern "C" float CustomOnDemandResourcesGetLoadingPriority(CustomOnDemandResourcesRequestData* data)
{
    return 0.0f;
}

extern "C" void CustomOnDemandResourcesSetLoadingPriority(CustomOnDemandResourcesRequestData* data, float priority)
{
}

extern "C" const char* CustomOnDemandResourcesGetResourcePath(CustomOnDemandResourcesRequestData * data, const char* resource)
{
    return NULL;
}

extern "C" void CustomOnDemandResourcesFreeString(const char* str) {

}

#endif // ENABLE_IOS_ON_DEMAND_RESOURCES

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