Where are stored form customization regions in the database ?

Is anyone know where are stored this datas in the database ?
They are not in the "modx_fc" tables.

I think everything is in those three tables. modx_fc_sets has the actual rules.

That's what I thought too, but, no. There is nothing in the table, neither in two others :


I was trying to know where was saved regions in order to try to fix the issue that makes new regions disappeared after the page is reloaded.
Even if the configuration still works after the reload, If you want to add new regions and save again, it erases all added regions.

This issue exists since 2 or 3 years, but If the regions are not saved in database, I understand why they disappear.

FC tends to slow things down a bit, so I almost never use it. Sorry I couldn't be more help.