Markdown preview doesn't work on pivot

[niekdemelker]

• Laravel Version: 11.36.1
• Nova Version: 5.0.6
• PHP Version: 8.3.15
• Reproduction Repository: https://github.com/###/###

Description:

I have a pivot table with a text area, so users can add notes to a relation in markdown, but the markdown preview doesn't work when i attach a attachment in Nova.

When I create an extra markdown field on the ralated resource the preview will work again. Problem is i also have to do this on the other side of the relation, defining the markdown field 3 times.

The url rendering the error looks as follow, you can see the preview is requesting to the Tenants.php and not to the SystemFields.php so it cannot render the preview.

/nova-api/tenants/field/comment/preview?editing=true&editMode=update

// Tenants.php resource field definition

BelongsToMany::make('Systems')
    ->fields(new SystemFields)

// Workaround to get the pivot table field working
Markdown::make('Notes')
    ->onlyOnIndex()
    ->hideFromIndex(),

// SystemFields.php

public function __invoke()
{
    return [
        Markdown::make('Notes')
            ->alwaysShow(),
    ];
}

Detailed steps to reproduce the issue on a fresh Nova installation:

Create a pivot table with text area, and define a markdown field in the BelongToMany fields.

[crynobone]

Reproduce step is not clear, please provide a full reproducing repository based on fresh installation as suggested in the bug report template (or you can refer to https://github.com/nova-issues for example)

[niekdemelker]

@crynobone sure thing: https://github.com/niekdemelker/issue-6643

1. publish assets and create a nova user
2. login
3. in the menu select 'Systems' and create a system
4. from this system, attach a user
5. in the form to select an user there is a markdown, the preview doesn't work <- the bug