RichTextLabel BBCode: cannot nest ordered lists inside unordered lists

[daenvil]

Tested versions

v4.2.2.stable.official [15073af]

System information

Godot v4.2.2.stable - Windows 10.0.19045 - GLES3 (Compatibility) - NVIDIA GeForce GTX 1050 Ti (NVIDIA; 31.0.15.3699) - AMD Ryzen 5 2600 Six-Core Processor (12 Threads)

Issue description

When writing an ordered list inside an unordered list, the ordered list is displayed as if it was unordered:

[ul]
item 1
item 2
[ol]
nested item 1
nested item 2
[/ol]
[/ul]

Specifying the types has no effect either:

The expected behavior would be for the nested list to be numbered.

Steps to reproduce

1. Create a scene
2. Add a RichTextLabel node and enable BBCode on it
3. Write a nested list such as the following:

[ul]
item 1
item 2
[ol]
nested item 1
nested item 2
[/ol]
[/ul]

4. The ordered list is not numbered

Minimal reproduction project (MRP)

ol_test.zip