Line object bending in unexpected ways during animation

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## Description of bug / unexpected behavior
Under specific circumstances a `Line` object can bend during an animation in unexpected ways despite `path_arc=0`.

## Expected behavior
A `Line` object should not have any curvature when `path_arc=0`.

## How to reproduce the issue

Code for reproducing the problem

This issue came up in this animation:
```
from manim import *

class Example(Scene):
def construct(self):
t = ValueTracker(0.1 * PI)
line = Line(end=(1,0,0))
line.add_updater(lambda m: m.put_start_and_end_on(
(3.4 , 0, 0),
(3.4 + 1.5*np.cos(t.get_value()), 1.5*np.cos(t.get_value()),0)
)
)

self.add(line)

self.play(
t.animate.set_value(12.1 * PI),
run_time=6,
rate_func=linear,
)
```

which was rendered with this command

```
manim -pql --fps=20 test.py Example
```

I already tried to reduce it to a minimal example. Different quality and frame rate settings produce different curvatures.
The shift in x-direction also influences the curvature.

## Additional media files

Images/GIFs

https://github.com/user-attachments/assets/e3921c3d-5a10-4505-98ad-93ee154affe9

## Logs
Terminal output

```
Manim Community v0.21.0

[08/20/26 09:54:09] DEBUG Hashing ... hashing.py:443
DEBUG Hashing done in 0.001507 s. hashing.py:462
DEBUG Hash generated : 1594855120_2984155222_1892506515 hashing.py:463
DEBUG List of the first few animation hashes of the scene: cairo_renderer.py:101
['1594855120_2984155222_1892506515']
INFO Animation 0 : Partial movie file written in scene_file_writer.py:192
'/home/[...]/wiggly_line_test
/media/videos/test/480p20/partial_movie_files/Example/159
4855120_2984155222_1892506515.mp4'
INFO Combining to Movie file. scene_file_writer.py:952
DEBUG Partial movie files to combine (1 files): scene_file_writer.py:834
['/home/[...]/wiggly_line_tes
t/media/videos/test/480p20/partial_movie_files/Example/15
94855120_2984155222_1892506515.mp4']
INFO scene_file_writer.py:1103
File ready at
'/home/[...]/wiggly_line_tes
t/media/videos/test/480p20/Example.mp4'

INFO Rendered Example scene.py:290
Played 1 animations
```

## System specifications

System Details

- Ubuntu 24.04.4
- Python 3.12.3

Run the provided minimal Example scene with the stated Manim command and compare different quality and frame-rate settings. Start by tracing Line.put_start_and_end_on during the ValueTracker updater and animation interpolation. Done means a Line with path_arc=0 remains straight throughout the animation, regardless of the tested shift, quality, or frame rate.

Written by the indexing model from the issue text.