Vanna White.Puck News reported Friday that White, 66, isn’t working the show’s annual “Teachers Week” this season after being diagnosed with COVID-19 — her absence coinciding with her ongoing contract negotiations.The longtime letter-turner reportedly contracted the virus in late July while “Wheel of Fortune” taped its teacher episodes, which are scheduled to air in October. Now a source is explaining why filming couldn’t wait until White got better.“Teachers had already arrived in L.A.