update _reset_thread_state

Author: sentrivana

sentry_sdk/_span_batcher.py

@@ -51,7 +51,7 @@ def __init__(
         self._active: "threading.local" = threading.local()
 
         self._last_full_flush: float = time.monotonic()  # drives time-based flushes
-        self._flush_event: threading.Event = threading.Event()
+        self._flush_event = threading.Event()
         self._pending_flush: set[str] = set()  # buckets to be flushed
 
         self._flusher: "Optional[threading.Thread]" = None
@@ -76,7 +76,9 @@ def _reset_thread_state(self) -> None:
         self._lock = threading.Lock()
         self._active = threading.local()
 
+        self._last_full_flush: float = time.monotonic()
         self._flush_event = threading.Event()
+        self._pending_flush: set[str] = set()
 
         self._flusher = None
         self._flusher_pid = None