C#: The dreaded “A generic error occurred in GDI+.” Exception

I have googled this a lot but not found any good solutions. Users upload images to the server via an Asp.Net API and the code below saves the files to disk. This works most of the time (1000s) but sometimes I get this GDI exception.

This uses .net 4.8, Asp.Net, and fails on both IIS for Windows Server 2019 an Windows 11.

Here’s my code:

string originalTmpPath = "D:\somePath\imageName.jpg"  
var obj = JsonConvert.DeserializeObject<Issue_ModelV2>(requestContent);  
  
byte[] parms = Convert.FromBase64String(obj.ImageData);  
using (var ms = new MemoryStream(parms))  
{  
    using (var img = System.Drawing.Image.FromStream(ms))  
    {  
        //Was getting this error:  ExternalException: A generic error occurred in GDI+.  
        //so I added the next line to see if it helped.  
        System.Drawing.Image copy = img;  
     
   // Get exception on this line  
        copy.Save(originalTmpPath, System.Drawing.Imaging.ImageFormat.Jpeg);  

I also tried this but go the same GDI exception:

System.Drawing.Image copy = img;  
var tmpImg = new Bitmap(copy);  
tmpImg.Save(originalTmpPath, ImageFormat.Jpeg);  

NOTE: If I run this in a .net 4.8 console app it runs fine. This is the code for that:

static void ProcessImage()  
{  
    string sourcePath = @"D:\Apps\zDeleteme\GDI Exception\GDI Exception\ImageData.txt";  
    string targetPath = @"D:\Apps\zDeleteme\GDI Exception\GDI Exception\ImageStorage\NiceImage.jpg";  
    string json = System.IO.File.ReadAllText(sourcePath);  
    var obj = JsonConvert.DeserializeObject<Issue>(json);  
    byte[] parms = Convert.FromBase64String(obj.ImageData);  
    using (var ms = new MemoryStream(parms))  
    {  
        using (var img = System.Drawing.Image.FromStream(ms))  
        {  
            //I tried some tips from here  
            //https://stackoverflow.com/questions/15571022/how-to-find-reason-for-generic-gdi-error-when-saving-an-image  
            System.Drawing.Image copy = img;  
            var tmpImg = new Bitmap(copy);  
            tmpImg.Save(targetPath, ImageFormat.Jpeg);  
  
        }  
    }  
}  

Thank you for any help you can offer.