Custom Predicate generates extra quote

[talalong]

I have this Ransack configuration long time ago.

Ransack.configure do |config|
  config.add_predicate 'in_list',
    arel_predicate: 'in',
    formatter: ->(v) { v&.split(';').join("','") }
end

Calling:

Table.ransack(column_in_list: 'test;othertest').result.to_sql

Expected

WHERE table.column IN ('test', 'othertest')

Actual

WHERE table.column IN ('test'',''othertest')

There is an extra single quote added by Ransack or ActiveRecord when building the query. This breaks the SQL syntax.
What I can confirm is, it worked before.

Environment

Rails: 7.x
Ransack: 4.x
Ruby: 3.x