classDiagram 'direction RL' state is maintained when removed

[Stemt]

Description

By default the direction of a classDiagram is Top-Down until one uses the 'direction RL' directive to change this to Right-Left.
I've however found that after removing this directive the classDiagram orientation stays Right-Left even if I use 'direction TD' (this is not officially mentioned in the documentation but would be intuitive and is a feature in other diagrams) .
This goes for both the mermaid live editor and my sphinx documentation.
In the live editor the diagram fixes itself after a page reload but I haven't been able find a fix for my sphinx documentation.

Steps to reproduce

1. Create A classDiagram e.g.

classDiagram
    test1 -- test2

This diagram should be in the Top-Down orientation.

2. Add 'direction RL' to the diagram

classDiagram
    direction RL
    test1 -- test2

The diagram should now be in the Right-Left orientation.

3. Remove 'direction RL' from the diagram

classDiagram
    test1 -- test2

The diagram should now once again be in Top-Down orientation, but is not.

4. Add 'direction TD' for good measure.

classDiagram
    direction TD
    test1 -- test2

It's now still in the Right-Left orientation.

Screenshots

Code Sample

No response

Setup

• Mermaid version: v10.9.1 (live editor) & v10.9.0 (sphinx docs)
• Browser and Version: [Chromium: 126.0.6478.126]

Suggested Solutions

• implement 'direction TD' to force direction instead of relying on it being the default direction.

Additional Context

No response

[sidharthv96]

Thanks for raising the issue @Stemt!
The direction was not being cleared properly, so it's been fixed in #5625, and should be available in the next release.