Hey @WolfiiDev -- thanks for posting. We actually noticed this internally yesterday, but if only we'd known you figured this out yesterday as well, that would've helped.
That said, the latest version of NodeBB should resolve this.
Employees & Interns of NodeBB
Could it be that the user was registered, but then later deleted their account? This would also cause some topics/posts to be owned by the Guest pseudo-user. @abhinov-singh
Alignment, colour, and such isn't supported by the base markdown plugin, but the markdown parser itself does have plugins that allow you to enhance the parser to use it.
Of course, downside is that you have to actually modify the markdown plugin to work with the markdown-it plugins, and that is custom development.
If you're interested in sponsoring development of the plugin, please contact us at firstname.lastname@example.org
Thanks @JJSagan -- unfortunately for Bootstrap we need to have them backport the fix to BS3, since we do not support Bootstrap 4 at the moment.
The other package are a little easier, and should be able to be updated with little fuss. We currently use Renovate to handle our dependency management.