Animation not interpolating exported variable

[no1idle]

Godot Version

4.5.1

Question

I am trying to animate an export variable using animation player a vector2 to be specific:

@export var position_offset : Vector2 = Vector2.ZERO : set = set_offset_position
....
func set_offset_position(new_offset: Vector2) -> void:
	#
	position_offset = new_offset	
	print(position_offset)

In the animation player i can add a track for the variable, i set the update mode of the track is continuos but when i run the animation the update is like the discrete case, so position_offset is updated only during the keyframes, not in between, the print output is something like this:

(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 0.0)
(0.0, 10.0)
(0.0, 10.0)
(0.0, 10.0)

am i doing something wrong, or simply missing something?
thanks for your help

[normalized]

Make sure that your animation track update mode is set to “continuous” and interpolation mode to “linear” or “cubic”.

[no1idle]

yes track update is set to “continuous” an interpolation mode to linear. Also i have forgot the routine is a tool, so it runs in the editor

[normalized]

What happens when you run the scene?

[no1idle]

Look, i feel stupid but i found the problem: i tried to do the same thing in a dummy empty project and everything worked. Then i noticed than in my project i had this strange error when i added a keyframe:

I could still set the values but initially i always had this error.
What i did is:
1 delete all tracks with this variable, including the reset one
2 restart the project.
Now if i add again the track everything works as expected. So i do not know if something was corrupt or some kind of a bug or something else but now it works
Thanks @normalized for your help