The same thing happened when i unsecured and pc to cash rewards. Took about 5 weeks to get new card, but was giving me rewards anyway.
Chase Sapphire Reserve $32.5K, Amex BCP $20K, Amex PRG NPSL, Amex Hilton Surpass $13,500, Amex Hilton $16,200, Discover it $16,000, Citi TYP $18,900, US Bank Cash+ Visa Sig $12,000, Virgin Atlantic World Elite MC $13,100, Merrill+ Visa Sig $10,000, Fidelity Visa Sig $14,000, Barclay Cash Forward $16,500, Wells Fargo Rewards $12,500, Local CU $7000, Barclay Apple Rewards $5500, Chase Freedom $5000,-- EQ FICO 768, EX FICO 777, TU FICO 781