Bug: Nested inlines don't work properly with extra=0

[AlexOteiza]

Reproduction steps:

• Create 3 nested models with its inline admin

class Top(models.Model):
    name = models.CharField(max_length=128)

class Middle(models.Model):
    top = models.ForeignKey(Top)
    name = models.CharField(max_length=128)

class Bottom(models.Model):
    middle = models.ForeignKey(Middle)
    name = models.CharField(max_length=128)

class BottomInline(NestedStackedInline):
    extra = 0
    model = Bottom

class MiddleInline(NestedStackedInline):
    model = Middle
    extra = 0
    inlines = [BottomInline]

class TopAdmin(NestedModel):
    model = Top
    inlines = [MiddleInline]

• Attempt to create a new Top object in django admin.

The Top model creation page has the name field and an empty group of Middle group with zero elements(expected)
But when you add a new Middle there is no Bottom group. (unexpected)
Only after saving one new Middle and re-editing the Top model again, Bottom Group will show (expected).

This does not happen with extra>0 in the BottomInline class

Django version 4.07