diff --git a/reflex/components/component.py b/reflex/components/component.py
index 9fea2f05b..5c6234749 100644
--- a/reflex/components/component.py
+++ b/reflex/components/component.py
@@ -645,7 +645,7 @@ class Component(BaseComponent, ABC):
         # Look for component specific triggers,
         # e.g. variable declared as EventHandler types.
         for field in self.get_fields().values():
-            if types._issubclass(field.type_, EventHandler):
+            if types._issubclass(field.outer_type_, EventHandler):
                 args_spec = None
                 annotation = field.annotation
                 if (metadata := getattr(annotation, "__metadata__", None)) is not None:
diff --git a/reflex/config.py b/reflex/config.py
index 7b910e3e1..53f5646ba 100644
--- a/reflex/config.py
+++ b/reflex/config.py
@@ -22,7 +22,7 @@ from typing import (
     get_args,
 )
 
-from typing_extensions import get_type_hints
+from typing_extensions import Annotated, get_type_hints
 
 from reflex.utils.exceptions import ConfigError, EnvironmentVarValueError
 from reflex.utils.types import GenericType, is_union, value_inside_optional
@@ -214,8 +214,8 @@ def interpret_int_env(value: str, field_name: str) -> int:
         ) from ve
 
 
-def interpret_path_env(value: str, field_name: str) -> Path:
-    """Interpret a path environment variable value.
+def interpret_existing_path_env(value: str, field_name: str) -> ExistingPath:
+    """Interpret a path environment variable value as an existing path.
 
     Args:
         value: The environment variable value.
@@ -233,6 +233,19 @@ def interpret_path_env(value: str, field_name: str) -> Path:
     return path
 
 
+def interpret_path_env(value: str, field_name: str) -> Path:
+    """Interpret a path environment variable value.
+
+    Args:
+        value: The environment variable value.
+        field_name: The field name.
+
+    Returns:
+        The interpreted value.
+    """
+    return Path(value)
+
+
 def interpret_enum_env(value: str, field_type: GenericType, field_name: str) -> Any:
     """Interpret an enum environment variable value.
 
@@ -286,6 +299,8 @@ def interpret_env_var_value(
         return interpret_int_env(value, field_name)
     elif field_type is Path:
         return interpret_path_env(value, field_name)
+    elif field_type is ExistingPath:
+        return interpret_existing_path_env(value, field_name)
     elif inspect.isclass(field_type) and issubclass(field_type, enum.Enum):
         return interpret_enum_env(value, field_type, field_name)
 
@@ -410,6 +425,13 @@ if TYPE_CHECKING:
         return default
 
 
+class PathExistsFlag:
+    """Flag to indicate that a path must exist."""
+
+
+ExistingPath = Annotated[Path, PathExistsFlag]
+
+
 class EnvironmentVariables:
     """Environment variables class to instantiate environment variables."""
 
@@ -438,7 +460,7 @@ class EnvironmentVariables:
     REFLEX_WEB_WORKDIR: EnvVar[Path] = env_var(Path(constants.Dirs.WEB))
 
     # Path to the alembic config file
-    ALEMBIC_CONFIG: EnvVar[Path] = env_var(Path(constants.ALEMBIC_CONFIG))
+    ALEMBIC_CONFIG: EnvVar[ExistingPath] = env_var(Path(constants.ALEMBIC_CONFIG))
 
     # Disable SSL verification for HTTPX requests.
     SSL_NO_VERIFY: EnvVar[bool] = env_var(False)
@@ -567,7 +589,7 @@ class Config(Base):
     telemetry_enabled: bool = True
 
     # The bun path
-    bun_path: Path = constants.Bun.DEFAULT_PATH
+    bun_path: ExistingPath = constants.Bun.DEFAULT_PATH
 
     # List of origins that are allowed to connect to the backend API.
     cors_allowed_origins: List[str] = ["*"]
@@ -691,7 +713,7 @@ class Config(Base):
                     )
 
                 # Interpret the value.
-                value = interpret_env_var_value(env_var, field.type_, field.name)
+                value = interpret_env_var_value(env_var, field.outer_type_, field.name)
 
                 # Set the value.
                 updated_values[key] = value
diff --git a/reflex/event.py b/reflex/event.py
index 8b75fc01f..86620e65d 100644
--- a/reflex/event.py
+++ b/reflex/event.py
@@ -1489,6 +1489,11 @@ if sys.version_info >= (3, 10):
             """
             return self
 
+        @overload
+        def __call__(
+            self: EventCallback[Q, T],
+        ) -> EventCallback[Q, T]: ...
+
         @overload
         def __call__(
             self: EventCallback[Concatenate[V, Q], T], value: V | Var[V]