The code change to `isinstance(span, Span)` excludes `StreamedSpan` instances from the error cleanup path. When span streaming is enabled and an Anthropic API call fails, `set_span_errored()` sets `span.status = SpanStatus.ERROR` ("error"), but the finally block only checks for `SPANSTATUS.INTERNAL_ERROR` ("internal_error") on legacy `Span` types. This causes `StreamedSpan` instances to remain unclosed when errors occur, potentially causing resource leaks and incorrect span timing in traces.

The code change to `isinstance(span, Span)` excludes `StreamedSpan` instances from the error cleanup path. When span streaming is enabled and an Anthropic API call fails, `set_span_errored()` sets `span.status = SpanStatus.ERROR` ("error"), but the finally block only checks for `SPANSTATUS.INTERNAL_ERROR` ("internal_error") on legacy `Span` types. This causes `StreamedSpan` instances to remain unclosed when errors occur, potentially causing resource leaks and incorrect span timing in traces.

In the span streaming branch, spans are always created regardless of whether the HTTP method is in `http_methods_to_capture`. The legacy branch correctly skips transaction creation when `ty == "http"` and `method not in self.http_methods_to_capture` (resulting in `transaction = None` and `nullcontext()`). However, in span streaming mode, `sentry_sdk.traces.start_span()` is called unconditionally on line 238-240, creating spans for all HTTP requests including those that should be filtered out.

When `old_execute_command` raises an exception, the `finally` block attempts to call `_set_cache_data(cache_span, self, cache_properties, value)` on line 158, but `value` is never assigned when an exception occurs. This results in an `UnboundLocalError`. While `capture_internal_exceptions()` suppresses this error, it masks the underlying bug and prevents proper cache span data from being recorded. The fix should initialize `value = None` before the try block.

When `old_execute_command` raises an exception, the `finally` block attempts to call `_set_cache_data(cache_span, self, cache_properties, value)` on line 158, but `value` is never assigned when an exception occurs. This results in an `UnboundLocalError`. While `capture_internal_exceptions()` suppresses this error, it masks the underlying bug and prevents proper cache span data from being recorded. The fix should initialize `value = None` before the try block.

When using span streaming mode, the getresponse handler sets the span status and reason but omits the HTTP status code attribute (SPANDATA.HTTP_STATUS_CODE). The legacy code path calls `span.set_http_status(int(rv.status))` which sets both the span status and stores the actual status code value. In streaming mode, the status code value is lost, which degrades telemetry data quality for HTTP client spans.

When using span streaming mode, the getresponse handler sets the span status and reason but omits the HTTP status code attribute (SPANDATA.HTTP_STATUS_CODE). The legacy code path calls `span.set_http_status(int(rv.status))` which sets both the span status and stores the actual status code value. In streaming mode, the status code value is lost, which degrades telemetry data quality for HTTP client spans.

When using span streaming mode, the getresponse handler sets the span status and reason but omits the HTTP status code attribute (SPANDATA.HTTP_STATUS_CODE). The legacy code path calls `span.set_http_status(int(rv.status))` which sets both the span status and stores the actual status code value. In streaming mode, the status code value is lost, which degrades telemetry data quality for HTTP client spans.