When using Set/GetMetadata in SSI extensions, the first character of the metadata is lost:

On server side:

std::string response_str = "HELLO WORLD";
SetMetadata(response_str.c_str(), response_str.size());

This puts 11 bytes of metadata on the wire: HELLO WORLD
48 45 4C 4C 4F 20 57 4F 52 4C 44

On client side:

const char *metadata_buffer = GetMetadata(metadata_len);

We receive a payload of the correct size (11 bytes) but the first byte is zero:
0 45 4C 4C 4F 20 57 4F 52 4C 44
metadata_len = 11, metadata_buffer = <0>ELLO WORLD

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