From 2edab61535c53ae9c665b931c78fcf77cc55407c Mon Sep 17 00:00:00 2001
From: John Fredrickson <john.fredrickson@leadventure.com>
Date: Tue, 23 Dec 2025 13:31:23 -0600
Subject: [PATCH] Write into stream instead of simply just advancing it.

---
 src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs b/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
index 491f716500..7cec7c1db8 100644
--- a/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
+++ b/src/ImageSharp/Formats/Webp/Chunks/WebpVp8X.cs
@@ -123,7 +123,10 @@ public void WriteTo(Stream stream)
         long pos = RiffHelper.BeginWriteChunk(stream, (uint)WebpChunkType.Vp8X);
 
         stream.WriteByte(flags);
-        stream.Position += 3; // Reserved bytes
+
+        Span<byte> reserved = stackalloc byte[3];
+        stream.Write(reserved);
+
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Width - 1);
         WebpChunkParsingUtils.WriteUInt24LittleEndian(stream, this.Height - 1);