You showed up too so seems speed wallet has a issue receiving on nostr as I can confirm when i sent the zaps showed up 
Discussion
I've always been able to zap WoS users, it just takes a few attempts sometimes to generate an invoice.
I will persist with trying until I get an error at which point, I move on. WoS rarely throws an error for some reason, not even a timeout error.
I've never heard of speed wallet before today.
I’ve had the same issue with invoice generation taking a couple of attempts. It hasn’t only been WoS for me though but occasionally some other wallets as well.