Why does sync disable when I use the pitch fader on the master deck?

So, I am a little confused. Here is the scenario

Set Deck A to Master
Set Deck B to Sync
Start playing a song in both decks
Drag the pitch fader on deck A and drag it up or down a notable amount

Result: Deck B unsyncs and sets itself as the master.

Why would it do this?

If I click the -/+ buttons a few times the tempo on deck B will stay synced and follow that of Deck A. Sometimes, when I only move the pitch fader a little bit then Deck B stays synced but if I move it more it suddenly unsyncs.

Is this intended behavior? Am I failing to understand how it should be used?

Cheers!

try toggling on both decks into sync mode

Sometimes if you move it to fast it will go out of sync.