@Cesar
You may need to bring all relevant files those are included in modified one.
Lastest Osclass might be able to handle it.
Child themes feature has been redesigned:
osc_current_web_theme_path, osc_current_web_theme_url - functions will now "hard" check child theme folders to identify child files.
osc_current_web_theme_path_value - new function created - function work in same way as osc_current_web_theme_url and return expected path.
Much better functionality at all, now it is not required to create all theme files for proper functionality of child theme.
No changes has been made in way how child theme is created and setup.