Ok, I give up 🏳️😭!
I now have a completely new setup. I loaded Amethyst from Obtainium and created a completely new WoS wallet for zapping. And the exact same problem persists. I just do not understand it. When I zap WoS users, the zaps don't appear in the chat and the users don't know that I zapped them. When I zap users who use other wallets it works without any problems. With Alby, with LNTipBot etc ... with ALL other wallets it works without any problems. It just doesn't work with WoS! Then I switched to the LNTipBot and thought, then it must work. And then WTF ... same problem. I give up haha ... If you're a WoS user reading this, if you get an Anon Zap, then maybe it was me or maybe it wasn't 😁😅🤘!

And interesting for me to know:
I'm I THE ONLY ONE with that issue? Let me know please!

@Vitor Pamplona or @Wallet of Satoshi, ideas regarding to that annoying issue are highly appreciated please 🙏!

nostr:nevent1qqs0pqrkhqqz5220z3xvmmhsvktqggj5gv70emd5fq65xeky8a7zv0sprdmhxue69uh5ummnw3ezuumhd9ehxtt9de5kwmtp9e3ksq3qn0aq6vafymeezu8rgyuluw2nsvwwf0e0qdpc9d2uvcfgclsf4d8sxpqqqqqqz2ssatr  

 Yep, the WoS service to send the Zap receipt into Nostr has been terrible for many months now. It's even worse when it is from WoS to WoS. 

I am not sure there is anything you or we can do. It's their own service that seems to be flaky. 

 Thank you for your answer Vitor. I've already started to doubt myself haha 😁😅! 

 I wanted to zap you 111 Sats and now the Zap is pending 👀😅!
Everything ok with your wallet? Let me know. I'll try again later.

(Note to myself: Today is a really strange day 🤣) 

 Ah ok, the Zap went through 👌 

 It's a sign to try a new wallet 🤷‍♂️ 

 As I mentioned, when I zap with LNTipBot it's the same 😭🤣🤷!
Think I have to try Alby next time. 

 I think for the zaps case, if wos does does not create these zap notes, then it does not matter from which app you zap, it won't appear.

You could vote with not zapping wos users and letting them know that zapping wos does not work for you.

People not zapping wos wallets -> people moving from wos -> wos wanting to fix

Might not work though. 

 Yes, really have to think about how I can handle this atm 

 Hi Vitor - any ideas what might be causing this? Is it only a problem for WoS wallets on Amethyst? 

 No, I think it's on the service you run to send the zap event after the payment has been received. Lots of people never received the event. In the past, it would happen a lot between zaps from WoS to WoS. Since the payment receipt event doesn't to show on any other client, I think it is something in the service itself.  

 Service running behind cloudflare or other ddos protection? Clients trying to connect to service via Tor or other non-conventional connectivity?