Sequence wallets support ERC‑4337 by validating signatures inside validateUserOp() in ERC4337v07. The function enforces that msg.sender is the entrypoint and then performs signature verification via an external self‑call: this.isValidSignature(userOpHash, userOp.signature).
Because of this external call, the msg.sender observed inside isValidSignature() (implemented in BaseAuth) becomes the wallet itself, not the entrypoint. As a result, the static signature validation in BaseAuth.signatureValidation()—which enforces a caller binding—fails whenever a non‑zero “expected caller” is set to the entrypoint.
Alpha: when using "this" the msg.sender becomes address(this), so make sure this is intended!
Conclusion
This finding would earn you $1416, verify the msg.sender is the expected one.