### 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)

for (int k = 0; k < p_index; k++) {
						uint32_t frame_delta = buffer.read(frame_bit_width);
						frame += frame_delta;
						for (uint32_t l = 0; l < COMPONENTS; l++) {
							if (bit_width[l] == 0) {
								continue; 
							}
							uint32_t valueu = buffer.read(bit_width[l] + 1);
							bool sign = valueu & (1 << bit_width[l]);
							int16_t value = valueu & ((1 << bit_width[l]) - 1);
							if (sign) {
								value = -value - 1;
							}
							decode[l] += value;
						}
					}
				}
				r_time = page.time_offset + double(frame) / double(compression.fps);
				for (uint32_t l = 0; l < COMPONENTS; l++) {
					r_value[l] = decode[l];
				}
				return true;
			} else {
				p_index -= subkeys;
			}
		}
	}
	return false;
}
bool Animation::is_variant_interpolatable(const Variant p_value) {