### 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)

Variant::Type type = p_value.get_type();
	return (type >= Variant::BOOL && type <= Variant::STRING_NAME) || type == Variant::ARRAY || type >= Variant::PACKED_INT32_ARRAY; 
}
Variant Animation::cast_to_blendwise(const Variant p_value) {
	switch (p_value.get_type()) {
		case Variant::BOOL:
		case Variant::INT: {
			return p_value.operator real_t();
		} break;
		case Variant::STRING:
		case Variant::STRING_NAME: {
			return string_to_array(p_value);
		} break;
		case Variant::RECT2I: {
			return p_value.operator Rect2();
		} break;
		case Variant::VECTOR2I: {
			return p_value.operator Vector2();
		} break;
		case Variant::VECTOR3I: {
			return p_value.operator Vector3();
		} break;
		case Variant::VECTOR4I: {
			return p_value.operator Vector4();
		} break;
		case Variant::PACKED_INT32_ARRAY: {