Same thing happened to me, all itineraries booked prior to Feb. 28 had my status follow with exception of airport standby for upgrades and the 25% bonus. Seating and medallion pre-boarding did follow, and my BP for those itineraries showed "Silver/Elite" even though I had not requalified.

However, due to a trip to HKG, I'm sitting at over 44k MQM now and will probably make Plat this year.