Clearing search index deletes any extra filter fields

Not sure if this is specific to this Postgres VDB module, or something more general in the parent AI VDB plugin support. But when using this module I see there is an option for a field added to the index to be "filterable". However, if I click the "Clear all indexed data" button, the parent module seems to delete the entire Collection and recreate the Collection. When recreating the Collection, it does not add these "extraFields" columns to the database table.

If I manually go into my Postgres database and add the columns for the extra "filterable" fields, then I am able to index them. But if I use the "Clear all" button again, my extra columns are removed again.