IndexError on TransformMatchingTex when use another latex font

When I use `Tex` and play `TransformMatchingTex` animations, an error occurred.
The error is: IndexError: list index out of range.

### Code and Error
**Code**:
```python
a = Tex(r'a+b=c').scale(3)
b = Tex(r'a+b=c,c\in\mathbb{Z}').scale(3)
self.add(a)
self.play(TransformMatchingTex(a, b, matched_keys=['a+b=c']))
```

**Error**:
```
WARNING Estimated size of a+b=c,c\in\mathbb{Z} tex_mobject.py:222
does not match true size

...

File "", line 198, in _run_module_as_main
File "", line 88, in _run_code
File "E:\Programs\python_tips_animation\.venv\Scripts\manimgl.exe\__main__.py", line 7, in
File "E:\Programs\python_tips_animation\manimlib\__main__.py", line 25, in main
scene.run()
File "E:\Programs\python_tips_animation\manimlib\scene\scene.py", line 163, in run
self.construct()
File "E:\Programs\python_tips_animation\for_tips\learning_transform_match.py", line 10, in construct
self.play(TransformMatchingTex(a, b, matched_keys=['a+b=c']))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\Programs\python_tips_animation\manimlib\animation\transform_matching_parts.py", line 135, in __init__
*self.matching_blocks(source, target, matched_keys, key_map),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\Programs\python_tips_animation\manimlib\animation\transform_matching_parts.py", line 166, in matching_blocks
if target[j] in sub_target.family_members_with_points():
~~~~~~^^^
File "E:\Programs\python_tips_animation\manimlib\mobject\svg\string_mobject.py", line 551, in __getitem__
return super().__getitem__(value)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\Programs\python_tips_animation\manimlib\mobject\mobject.py", line 399, in __getitem__
return self.split().__getitem__(value)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
IndexError: list index out of range
```

It's very strange that when I remove the specified font `\mathbb{Z}` and just use `Z`, the errors and warnings disappear.

### Environment
**OS System**: Win 10
**manim version**: Latest Version of Manim
**python version**: 3.12.1