### 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)

if (!p_loop_wrap || loop_mode == LOOP_NONE) {
				pre_t = p_keys[pre].time - p_keys[idx].time;
				to_t = p_keys[next].time - p_keys[idx].time;
				post_t = p_keys[post].time - p_keys[idx].time;
			} else if (loop_mode == LOOP_LINEAR) {
				pre_t = pre > idx ? -length + p_keys[pre].time - p_keys[idx].time : p_keys[pre].time - p_keys[idx].time;
				to_t = next < idx ? length + p_keys[next].time - p_keys[idx].time : p_keys[next].time - p_keys[idx].time;
				post_t = next < idx || post <= idx ? length + p_keys[post].time - p_keys[idx].time : p_keys[post].time - p_keys[idx].time;
			} else {
				pre_t = p_keys[pre].time - p_keys[idx].time;
				to_t = p_keys[next].time - p_keys[idx].time;
				post_t = p_keys[post].time - p_keys[idx].time;
				if ((pre > idx && idx == next && post < next) || (pre < idx && idx == next && post > next)) {
					pre_t = p_keys[idx].time - p_keys[pre].time;
				} else if (pre == idx) {
					pre_t = idx < next ? -p_keys[idx].time * 2.0 : (length - p_keys[idx].time) * 2.0;
				}
				if (idx == next) {
					to_t = pre < idx ? (length - p_keys[idx].time) * 2.0 : -p_keys[idx].time * 2.0;
					post_t = p_keys[next].time - p_keys[post].time + to_t;
				} else if (next == post) {
					post_t = idx < next ? (length - p_keys[next].time) * 2.0 + to_t : -p_keys[next].time * 2.0 + to_t;
				}
			}
			if (p_interp == INTERPOLATION_CUBIC_ANGLE) {
				return _cubic_interpolate_angle_in_time(
						p_keys[pre].value, p_keys[idx].value, p_keys[next].value, p_keys[post].value, c,
						pre_t, to_t, post_t);
			}
			return _cubic_interpolate_in_time(