Messages missing from the archive

Some messages are present in zulip chat, but are completely missing from the hosted html. For example, [#wasmtime > ✔ C FFI Bindings WASI building](https://bytecodealliance.zulipchat.com/#narrow/channel/217126-wasmtime/topic/.E2.9C.94.20C.20FFI.20Bindings.20WASI.20building/with/542340398)'s counterpart in html is [this link](https://bytecodealliance.github.io/zulip-archive/stream/217126-wasmtime/topic/.E2.9C.94.20C.20FFI.20Bindings.20WASI.20building.html) which is missing the initial message that started the topic.

This is probably a zulip issue, but it's better to have a tracking issue.

Start by comparing the Zulip topic linked in the issue with its hosted HTML counterpart, focusing on why the initial topic message is absent. The issue names no repository file, test, or entry point, so first locate the archive-generation path and establish how completeness should be checked; done means the missing message appears in the generated archive.

Written by the indexing model from the issue text.