Importing a form with (legacy) Objects API registration results in error

[stevenbal]

Product versie / Product version

Export from 2.6.12 / Import on cbdf97d17c273e9cba67d3073923a6a928a18370

Customer reference

No response

Omschrijf het probleem / Describe the bug

When importing a form with (legacy) Objects API registration, the following error occurs:

@sergei-maertens mentioned that the changes to add this conversion to the import logic may have been added in one of @Viicos branches, this issue is to ensure we don't lose track of this change

Stappen om te reproduceren / Steps to reproduce

This can be tested by importing the .zip attached in taiga Gemeente Utrecht Common Ground issue #247

Verwacht gedrag / Expected behavior

The import should succeed

Screen resolution

None

Device

None

OS

None

Browser

No response