Tweener doesn't keep final value from last tweener when combining as_relative and set_delay

[Phoenixkaze]

Tested versions

v4.2.1.stable.official [b09f793]

System information

Godot v4.2.1.stable - Windows 10.0.22631 - Vulkan (Forward+) - integrated Intel(R) Iris(R) Xe Graphics (Intel Corporation; 31.0.101.5445) - 12th Gen Intel(R) Core(TM) i5-12500H (16 Threads)

Issue description

This piece of code:

func _ready() -> void:
	progress_bar.value = 20
	var tween = create_tween()
	tween.tween_property(progress_bar, "value", 30, 1).as_relative()
	tween.tween_property(progress_bar, "value", -10, 1).as_relative().set_delay(1)

(if I am right) should tween the value of the progress bar to 50, then 40 in a delay of 1s. But it gets 10 in the end.

It works as expected if I remove set_delay and add a tween_interval.

It's not a bug of progress bar. It can be reproduced on other objects.

Seems the condition in PropertyTweener::start() makes it so?

Steps to reproduce

Run the main scene

Minimal reproduction project (MRP)

TweenerIssue.zip