When you jam a bug that no AI can solve for you...

When you jam a bug that no AI can solve for you... Spent hours debugging a gasless transaction flow using Dynamic.xyz + ZeroDev (ERC-4337 Account Abstraction). The goal was simple, let users withdraw ERC-20 tokens without ever touching ETH for gas. The Paymaster handles it. Clean UX. No seed phrases, no gas headaches. Except it wasn't working. Every UserOperation was getting rejected at the bundler (Pimlico) with: AA21 didn't pay prefund For anyone who's worked with ERC-4337, AA21 means the Paymaster either isn't set up, isn't funded, or isn't authorizing the transaction. Classic rabbit hole. I checked everything: ZeroDev Project ID - correct Paymaster policy - active Smart wallet factory - deploying correctly kernelClient routing - UserOps going through the bundler Still failing. Same ZeroDev project ID. Same chain (Base Sepolia). Same code. Every AI model I threw this at suggested code changes. I made code changes for weeks. Nothing moved. Then I noticed something, the exact same Zer