"Directive unknown" warning for 3rd-party directives

[mason3k]

I am looking for the recommended way to resolve a build warning when the directive comes from a separate 3rd-party extension.

Even when using the only directive to house the third-party extension, I still get the warning for, for example, when running the html builder with a directive meant for the confluence builder:
WARNING: Unknown directive type: 'confluence_toc' [myst.directive_unknown]

I know that I could suppress the warning in conf.py but is there a way to handle these spurious errors better without suppressing real errors?