After running @@migrate_to_volto translations are lost

[rstefko]

BUG/PROBLEM REPORT (OR OTHER COMMON ISSUE)

What I did:

Running Plone 6.0.5. In classic UI I can click between translations they are also returned by API.

After the migration to Volto, translations are no longer available. I have to link them manually.

I also noticed that after migration, Dexterity type Page (Document) has flag Multilingual Support unset.

What I expect to happen:

Migrated also with translations.

What actually happened:

Translations not migrated.

What version of Plone/ Addons I am using:

Plone 6.0.5 (6015)
CMF 3.0
Zope 5.8.2
Python 3.11.3 (main, May 23 2023, 13:34:03) [GCC 10.2.1 20210110]
PIL 9.5.0 (Pillow)
WSGI: On
Server: waitress 2.1.2

[davisagli]

How did you do the migration?

[rstefko]

I am migrating from Plone 4.3 to 6 using import / export - @@import_content and @@import_translations.
It looks like that if I run @@import_content again after @@migrate_to_volto it recreates the translations.
But I noticed another weird thing. We use English and Czech. When I am on Czech version it knows what is the English version, but on English version it does not know what is the Czech version.

[davisagli]

Okay, I will move this issue to plone.volto because that is the package that includes the @@migrate_to_volto view.