Core

Using the TCA field type "select" with an MM table prevents values to be properly mapped upon localization of the whole record.

This works fine for non-MM relations via foreign_field and even with IRRE. However, the processing in t3lib_TCEmain::copyRecord_procBasedOnFieldType simply transfers the original values to the localized copy.

If you use something like <foreign_table>.sys_language_uid IN (-1, 0) in your foreign_table_where, you at least see the original values afterwards. But the preferred display would be achieved via <foreign_table>.sys_language_uid = ###REC_FIELD_sys_language_uid###. Only this way foreign records with the same language as the local record are displayed.

There should be extra processing which takes into account possible translations of foreign records referred in such a field.