[Bug]: Legacy transactions on mainnet, Legacy and EIP 1559 on Avalanche fail

[sleepytanya]

Describe the bug

Both Legacy and EIP 1559 fail with 'Internal JSON-RPC error' on Avalanche. Legacy tx fail with "processing response error" on Ethereum.

Expected behavior

-

Screenshots/Recordings

https://github.com/user-attachments/assets/6785e9b2-9640-4cc0-bdca-d9291eb206ac

Steps to reproduce

1. Connect to test dapp
2. Send Legacy / EIP 1559 tx on Avalanche and Ethereum mainnet

Error messages or log output

No response

Detection stage

On the development branch

Version

dev build

Build type

None

Browser

Chrome

Operating system

MacOS

Hardware wallet

No response

Additional context

No response

Severity

No response

[sleepytanya]

Same bug is present on current develop, additionally Legacy tx also fails on Sepolia:

[Unik0rnMaggie]

Reproduced on caip25-permission-migration branch

https://github.com/user-attachments/assets/f79d09ce-183e-4d55-bb85-eb9222f95b79