Texture gaps while block breaking with Chunk Builder set to Threaded

What is the "Chunk Builder" setting set to?

Threaded which is the default setting I believe.

Well, the description of the Threaded setting does state that it "may result in brief visual holes when blocks are destroyed", so this is probably WAI/WF. Confirmed regardless.

I even asked community support and they didn't remember that either. It might be more noticeable during snapshots.