Why do callbacks return Continue when VM crashes

[bhakta0007]

I am trying this with onRequestHeaders. I deliberately introduced an exception so the WASM VM crashes. I notice that the return value of onRequestHeaders is FilterHeadersStatus::Continue.

Why is this the case?

context:cc

FilterHeadersStatus ContextBase::onRequestHeaders(uint32_t headers, bool end_of_stream) {
  CHECK_FAIL_HTTP(FilterHeadersStatus::Continue, FilterHeadersStatus::StopAllIterationAndWatermark);
  if (!wasm_->on_request_headers_abi_01_ && !wasm_->on_request_headers_abi_02_) {
    return FilterHeadersStatus::Continue;
  }
  DeferAfterCallActions actions(this);
  const auto result = wasm_->on_request_headers_abi_01_.    <<< this result is FilterHeadersStatus::Continue
                          ? wasm_->on_request_headers_abi_01_(this, id_, headers)
                          : wasm_->on_request_headers_abi_02_(this, id_, headers,
                                                              static_cast<uint32_t>(end_of_stream));

  CHECK_FAIL_HTTP(FilterHeadersStatus::Continue, FilterHeadersStatus::StopAllIterationAndWatermark);
  return convertVmCallResultToFilterHeadersStatus(result);
}

cc: @PiotrSikora