matrix: Message body does not get dropped when there are attachments #468

Job	Run time
test (stable)	1m 56s
golangci-lint	24s
test (1.24.x)	1m 42s
build-upload (amd64, windows, windows)	1m 21s
build-upload (amd64, mac, darwin)	1m 24s
build-upload (amd64, linux, linux)	1m 26s
	8m 13s

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