fix(tracing_utils): use maxsplit=1 in Baggage header parsing to handle values with '=' characters

Baggage values that contain '=' (e.g. base64-encoded strings) caused
str.split("=") to return more than two parts, raising ValueError which
was silently swallowed by capture_internal_exceptions(), dropping the
sentry baggage item entirely. Fix: item.split("=", 1).

Fixes #6449

Author: devteamaegis

sentry_sdk/tracing_utils.py

@@ -719,7 +719,7 @@ def from_incoming_header(
 
                 with capture_internal_exceptions():
                     item = item.strip()
-                    key, val = item.split("=")
+                    key, val = item.split("=", 1)
                     if Baggage.SENTRY_PREFIX_REGEX.match(key):
                         baggage_key = unquote(key.split("-")[1])
                         sentry_items[baggage_key] = unquote(val)

tests/test_tracing_utils.py

@@ -279,3 +279,10 @@ def test_should_continue_trace(
 
     baggage = Baggage.from_incoming_header(baggage_header) if baggage_header else None
     assert _should_continue_trace(baggage) == should_continue_trace
+
+
+def test_baggage_from_incoming_header_value_with_equals_sign():
+    # Baggage values that legitimately contain '=' (e.g. base64) must not be dropped
+    header = "sentry-release=v1.0==1,sentry-trace_id=abc123"
+    baggage = Baggage.from_incoming_header(header)
+    assert baggage.sentry_items == {"release": "v1.0==1", "trace_id": "abc123"}