[5.x]: Hyphen/Dash is removed after saving the CSS class in LinkField

[ayacoo]

What happened?

Description

I have defined a field that uses the ‘Link’ type. There, I have activated the CSS class setting.

I want to save ‘button--download’ in the field. After saving, only ‘button-download’ appears there.

Expected behavior

The CSS class ‘button--download’ remains unchanged.

Actual behavior

The CSS class ‘button--download’ is changed and saved as ‘button-download’.

Craft CMS version

5.8.21

PHP version

8.4.12

Operating system and version

No response

Database type and version

MySQL 8.0.40

Image driver and version

No response

Installed plugins and versions

[linear]

CMS-1739