migration fails for long foreign key names

When having a model with short name and i18n field which is versioned, everthing is right. There are no problems when doing diff and migration again and again. Nothing will happen because nothing changed.
For example:
mytest:
actAs:
I18n:
fields: [ description_front ]
actAs:
Timestampable:
Versionable:
columns:
title:

description_front:

But when using a longer model name like 'mytestmytestmytest' then some strange errors occurred in my simple example. After creating the 'translation' and 'transalation_version' table in '1273139712_version2.php' and creating the foreign keys in '1273139713_version3.php' there shouldn'd be a '1273146011_version4.php' generated by doing a diff, because everthing was already done. And of course when doing a migration with this last version, you will get errors.