The auto generated minibits addresses allow for a ln to ecash bridge. You can zap notes with ecash and get zaps on notes that convert to ecash. 
The other address types just give ecash functions not zap functions. 

 Isn't it the same? I can zap your note from my minibits wallet, and you would receive ecash. If you zap me I receive ecash. If I add your contact to my wallet I can send direct ecash to you from the wallet.  

 Maybe your custom address works, mine currently only works with the generated ones. 

 I only changed the username. I sent you 21 sats, zero fee, because it's the same LN node from minibits. Still don't know why it doesn't appear as a zap in the note though. Either way, the wallet is very nice.  

 Shows as an error in my wallet.  

 Yeah strange it looks good on my side but really doesn't even appears on Nostr.  

 I think the zap is private. The SATs however show an error in my minibits. I will try and recover them later.  

 Working through errors with Dev. It is all very early. 

 Just cleared. Thanks!