I manage to fix my theme, but it require some technical work. The theme doesn't work because MIUI theme app views it as outdated, so you have to change the details of the theme to make it updated. Someone gave these instructions -
1.- Extract the theme you lost compatibility, you can use MIUI theme editor to extract.
2.- Open mtz generated (prefer with pc)
3.- Open description.xml
4.- Change Value of uiVersion to 12
5.- Replace <version> line to <miuiAdapterVersion><![CDATA[2.0]]></miuiAdapterVersion> (This help to compatibility warning message when you apply a theme)
6.- Save or update with mtz file with the new description.xml file
7.- Delete old theme, and import new theme.
I used xiaomi theme editor app to extract the theme file from mtz and changed the description.xml to the values above and now the theme works as it should. But this solution is not for everyone and you will need to know how to use the theme application to fix it.