fix zipentry comment being lost after reading local entry header

src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs

@@ -18,6 +18,4 @@ public class ZipArchiveEntry : ZipEntry, IArchiveEntry
     public bool IsComplete => true;
 
     #endregion
-
-    public string? Comment => ((SeekableZipFilePart)Parts.Single()).Comment;
 }

src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs

@@ -128,6 +128,4 @@ internal class DirectoryEntryHeader : ZipFileEntry
     public ushort InternalFileAttributes { get; set; }
 
     public ushort DiskNumberStart { get; set; }
-
-    public string? Comment { get; private set; }
 }

src/SharpCompress/Common/Zip/Headers/ZipFileEntry.cs

@@ -120,4 +120,6 @@ internal abstract class ZipFileEntry : ZipHeader
     internal ZipFilePart? Part { get; set; }
 
     internal bool IsZip64 => CompressedSize >= uint.MaxValue;
+
+    internal string? Comment { get; set; }
 }

src/SharpCompress/Common/Zip/SeekableZipFilePart.cs

@@ -25,14 +25,8 @@ internal class SeekableZipFilePart : ZipFilePart
         return base.GetCompressedStream();
     }
 
-    internal string? Comment => ((DirectoryEntryHeader)Header).Comment;
-
-    private void LoadLocalHeader()
-    {
-        var hasData = Header.HasData;
-        Header = _headerFactory.GetLocalHeader(BaseStream, ((DirectoryEntryHeader)Header));
-        Header.HasData = hasData;
-    }
+    private void LoadLocalHeader() =>
+        Header = _headerFactory.GetLocalHeader(BaseStream, (DirectoryEntryHeader)Header);
 
     protected override Stream CreateBaseStream()
     {

src/SharpCompress/Common/Zip/SeekableZipHeaderFactory.cs

@@ -149,6 +149,11 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         {
             throw new InvalidOperationException();
         }
+
+        // populate fields only known from the DirectoryEntryHeader
+        localEntryHeader.HasData = directoryEntryHeader.HasData;
+        localEntryHeader.Comment = directoryEntryHeader.Comment;
+
         if (FlagUtility.HasFlag(localEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
         {
             localEntryHeader.Crc = directoryEntryHeader.Crc;

src/SharpCompress/Common/Zip/ZipEntry.cs

@@ -83,4 +83,6 @@ public class ZipEntry : Entry
     public override bool IsSplitAfter => false;
 
     internal override IEnumerable<FilePart> Parts => _filePart.Empty();
+
+    public string? Comment => _filePart?.Header.Comment;
 }