No copy content from buttons in StreamFields

[Naumov1889]

What I did

After updating from

Django==3.0
wagtail==2.10
wagtail-modeltranslation==0.10.16

to

django==4.1.3
wagtail==4.2.2
wagtail-modeltranslation==0.14.0

I don't see "copy content from" buttons alongside StreamField title.

---

How it looks

How it was

How it's now

---

The code

models.py

from wagtail.models import Page
from wagtail.fields import StreamField
from wagtail.admin.panels import FieldPanel
from wagtail import blocks


class SectionBlock(blocks.StructBlock):
    text = blocks.CharBlock(required=False)


class BasePage(Page):
    body = StreamField(
        [("section", SectionBlock())],
        null=True,
        blank=True,
        use_json_field=True,
    )
    content_panels = Page.content_panels + [FieldPanel("body")]

translation.py

from modeltranslation.translator import TranslationOptions
from modeltranslation.decorators import register
from .models import BasePage

@register(BasePage)
class BasePageTR(TranslationOptions):
    fields = ("body",)

settings.py

INSTALLED_APPS = [
    'wagtail_modeltranslation',
    'wagtail_modeltranslation.makemigrations',
    'wagtail_modeltranslation.migrate',
    'myapp',
]

MODELTRANSLATION_DEFAULT_LANGUAGE = 'ru'
MODELTRANSLATION_PREPOPULATE_LANGUAGE = 'en'
WAGTAILMODELTRANSLATION_TRANSLATE_SLUGS = False

LANGUAGE_CODE = 'ru'
LANGUAGES = [
    ('ru', 'Russian'),
    ('en', 'English'),
]

[TheCodingSheikh]

fixed with this pull request
#410