Deleting pre-message and downloading post-message later creates a device message with an error

There was a report of a failure: "❌ Failed to receive a message: Failed to load webxdc instance that we just checked exists: Message Msg#326 does not exist. Core version v2.49.0. Please report this bug to delta@merlinux.eu or https://support.delta.chat/."

I managed to reproduce it with a Rust test by receiving a pre-message, then deleting it, then receiving a post-message.