[Koha] UNIMARC problem with 2.2.6

Dear all, Does anyone noticed yet that with the new release 2.2.6, when using UNIMARC (chosen in instalation) you cannot create a new marc structure? I mean, Koha creates the new framework but empty, with no tags (which should be those in the default framework). Using MARC21 everything goes just fine, but I would like to use UNIMARC. Any ideas?