### Tested versions

- Reproducible in: v4.2.stable.official [46dc27791]
- Not reproducible in: v4.1.3.stable

### System information

Godot v4.2.stable - Windows 10.0.22621 - Vulkan (Forward+) - dedicated AMD Radeon RX 6600 (Advanced Micro Devices, Inc.; 31.0.21023.2010) - AMD Ryzen 7 5700X 8-Core Processor (16 Threads)

### Issue description

Starting with Godot 4.2, changing a Control node's anchor offsets with an AnimationPlayer node results in the offsets "snapping" to the keyframes, as if Nearest interpolation were used. 

This only applies to the Linear Interpolation Mode; Cubic still works as expected.

![resize_interp_fail](https://github.com/godotengine/godot/assets/26508550/a10a973f-afdc-45f2-986c-594aa3cdc9dc)

I encountered this regression when upgrading my project from 4.1.3 to 4.2. Minimum reproduction project provided below.

### Steps to reproduce

- Create a Control node with a Custom anchor preset.
- Create an AnimationPlayer track for one or more of its anchor offsets, with the Continuous update mode and Linear interpolation.
- Add keyframes to track(s)
- Play animation (either in the editor or in-game)

### Minimal reproduction project (MRP)

[ControlResize.zip](https://github.com/godotengine/godot/files/13589517/ControlResize.zip)

case Variant::RECT2: {
			Rect2 a = p_a;
			Rect2 b = p_b;
			Rect2 pa = p_pre_a;
			Rect2 pb = p_post_b;
			return Rect2(
					a.position.cubic_interpolate_in_time(b.position, pa.position, pb.position, p_c, p_b_t, p_pre_a_t, p_post_b_t),
					a.size.cubic_interpolate_in_time(b.size, pa.size, pb.size, p_c, p_b_t, p_pre_a_t, p_post_b_t));
		}
		case Variant::VECTOR3: {
			Vector3 a = p_a;
			Vector3 b = p_b;
			Vector3 pa = p_pre_a;
			Vector3 pb = p_post_b;
			return a.cubic_interpolate_in_time(b, pa, pb, p_c, p_b_t, p_pre_a_t, p_post_b_t);
		}
		case Variant::QUATERNION: {
			Quaternion a = p_a;
			Quaternion b = p_b;
			Quaternion pa = p_pre_a;
			Quaternion pb = p_post_b;
			return a.spherical_cubic_interpolate_in_time(b, pa, pb, p_c, p_b_t, p_pre_a_t, p_post_b_t);
		}
		case Variant::AABB: {
			AABB a = p_a;
			AABB b = p_b;
			AABB pa = p_pre_a;
			AABB pb = p_post_b;
			return AABB(
					a.position.cubic_interpolate_in_time(b.position, pa.position, pb.position, p_c, p_b_t, p_pre_a_t, p_post_b_t),