Image proxy shows broken image

[Walter]

For 5 days the image showed correctly. After the 5 days, the image shows as broken (exactly my proxy image cache lifetime). Xenforo latest 2.2 version, PHP 8.0.

• Test image proxy shows the image is working
• Image size is way under 5 MB and it has the correct extension (PNG)
• Image is hosted on a domain under my control and is available
• When I edit the post, the image shows correctly
• No cloudflare or other caching involved

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