Can object be partially cached when TCP connection is closed?

We are experiencing a situation that jpeg images are partially rendered.
Like, the upper half of the image is shown while the bottom below is grayed.


Based on the log of the ECS container termination, this problem seems to be related to TCP disconnection.

So what’s the behavior of Cloudflare when Content-Length is mismatched with actual body size?

There’s relevant documentation from CloudFront:

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