diff --git a/manimlib/animation/composition.py b/manimlib/animation/composition.py
index 40b09dcf..aa99860b 100644
--- a/manimlib/animation/composition.py
+++ b/manimlib/animation/composition.py
@@ -43,7 +43,7 @@ class AnimationGroup(Animation):
         mobs = remove_list_redundancies([a.mobject for a in self.animations])
         if group is not None:
             self.group = group
-        if group_type is not None:
+        elif group_type is not None:
             self.group = group_type(*mobs)
         elif all(isinstance(anim.mobject, VMobject) for anim in animations):
             self.group = VGroup(*mobs)
diff --git a/manimlib/animation/fading.py b/manimlib/animation/fading.py
index c4840ab8..18fa9ff8 100644
--- a/manimlib/animation/fading.py
+++ b/manimlib/animation/fading.py
@@ -6,6 +6,7 @@ from manimlib.animation.animation import Animation
 from manimlib.animation.transform import Transform
 from manimlib.constants import ORIGIN
 from manimlib.mobject.types.vectorized_mobject import VMobject
+from manimlib.mobject.mobject import Group
 from manimlib.utils.bezier import interpolate
 from manimlib.utils.rate_functions import there_and_back
 
@@ -101,7 +102,7 @@ class FadeTransform(Transform):
         self.dim_to_match = dim_to_match
 
         mobject.save_state()
-        super().__init__(mobject.get_group_class()(mobject, target_mobject.copy()), **kwargs)
+        super().__init__(Group(mobject, target_mobject.copy()), **kwargs)
 
     def begin(self) -> None:
         self.ending_mobject = self.mobject.copy()
diff --git a/manimlib/animation/numbers.py b/manimlib/animation/numbers.py
index 4a192b6a..d62b5ae4 100644
--- a/manimlib/animation/numbers.py
+++ b/manimlib/animation/numbers.py
@@ -29,9 +29,9 @@ class ChangingDecimal(Animation):
         self.mobject = decimal_mob
 
     def interpolate_mobject(self, alpha: float) -> None:
-        self.mobject.set_value(
-            self.number_update_func(alpha)
-        )
+        true_alpha = self.time_spanned_alpha(alpha)
+        new_value = self.number_update_func(true_alpha)
+        self.mobject.set_value(new_value)
 
 
 class ChangeDecimalToValue(ChangingDecimal):
diff --git a/manimlib/mobject/number_line.py b/manimlib/mobject/number_line.py
index 7f27f6a9..57456eff 100644
--- a/manimlib/mobject/number_line.py
+++ b/manimlib/mobject/number_line.py
@@ -164,7 +164,7 @@ class NumberLine(Line):
         **number_config
     ) -> DecimalNumber:
         number_config = merge_dicts_recursively(
-            number_config, self.decimal_number_config,
+            self.decimal_number_config, number_config,
         )
         if direction is None:
             direction = self.line_to_number_direction
diff --git a/manimlib/mobject/svg/drawings.py b/manimlib/mobject/svg/drawings.py
index fa278f40..4f105627 100644
--- a/manimlib/mobject/svg/drawings.py
+++ b/manimlib/mobject/svg/drawings.py
@@ -344,6 +344,8 @@ class ClockPassesTime(AnimationGroup):
                 angle=12 * hour_radians,
                 **rot_kwargs
             ),
+            group=clock,
+            run_time=run_time,
             **kwargs
         )
 
diff --git a/manimlib/mobject/vector_field.py b/manimlib/mobject/vector_field.py
index b349e7e5..89e3d9ae 100644
--- a/manimlib/mobject/vector_field.py
+++ b/manimlib/mobject/vector_field.py
@@ -145,6 +145,7 @@ class VectorField(VMobject):
         func: Callable[[VectArray], VectArray],
         # Typically a set of Axes or NumberPlane
         coordinate_system: CoordinateSystem,
+        sample_coords: Optional[VectArray] = None,
         density: float = 2.0,
         magnitude_range: Optional[Tuple[float, float]] = None,
         color: Optional[ManimColor] = None,
@@ -168,14 +169,17 @@ class VectorField(VMobject):
         self.norm_to_opacity_func = norm_to_opacity_func
 
         # Search for sample_points
-        self.sample_coords = get_sample_coords(coordinate_system, density)
+        if sample_coords is not None:
+            self.sample_coords = sample_coords
+        else:
+            self.sample_coords = get_sample_coords(coordinate_system, density)
         self.update_sample_points()
 
         if max_vect_len is None:
             step_size = get_norm(self.sample_points[1] - self.sample_points[0])
             self.max_displayed_vect_len = max_vect_len_to_step_size * step_size
         else:
-            self.max_displayed_vect_len = max_vect_len * coordinate_system.get_x_unit_size()
+            self.max_displayed_vect_len = max_vect_len * coordinate_system.x_axis.get_unit_size()
 
         # Prepare the color map
         if magnitude_range is None:
@@ -406,7 +410,7 @@ class StreamLines(VGroup):
 
         noise_factor = self.noise_factor
         if noise_factor is None:
-            noise_factor = (cs.get_x_unit_size() / self.density) * 0.5
+            noise_factor = (cs.x_axis.get_unit_size() / self.density) * 0.5
 
         return np.array([
             coords + noise_factor * np.random.random(coords.shape)