I've noticed the same thing with a lower number of visible google bots, but even on non-threads sites. Here we only see a couple online, but using their tools it's showing that they are crawling the site regularly, and not encountering any errors during their crawls.
The best thing I can recommend is to use their site overview tools. You can get information here as to how recently they've crawled your site, how many pages they are indexing on an average day, what pages they have encountered errors during their crawls, etc.
