Edit: I've definitely seen people on Twitter and people in the media be overzealous when denying the lab-leak theory; but that's not the same as the scientists themselves doing it (which again, I don't know about either way).
Relevant excerpts:
> The rapid, open, and transparent sharing of data on this outbreak is now being threatened by rumours and misinformation around its origins. We stand together to strongly condemn conspiracy theories suggesting that COVID-19 does not have a natural origin.
> Conspiracy theories do nothing but create fear, rumours, and prejudice that jeopardise our global collaboration in the fight against this virus. We support the call from the Director-General of WHO to promote scientific evidence and unity over misinformation and conjecture.
Scientists confusing absence of evidence with evidence of absence (i.e. "we don't have evidence of lab leaks, so anyone claiming it's a lab leak is definitely wrong") -> joke of a scientist
Scientists making a statement not from scientific evidence but due to political expediency (see sibling post, i.e. "conspiracy theories are making China unhappy and they might not share data with us") -> political actors