When the contract 1_Accumulator.sol is deployed to the test network, the "add" method works correctly, but at the same time, when the "getSum" method is called, nothing happens, only a Message expired error occurs (code 1006). However, adding call to tvm.accept solves the problem and the GetSum function works correctly.

Apart from the fact that C, C++ and Solidity have different syntax, when it comes to writing smart contracts for TON, are they all equal? Is the produced code equal? Does the TON virtual machine view all 3 equally? Is there any difference in performance?