Django Admin 3.1.7: getting RelatedObjectDoesNotExist for required ForeignKey

Hello,

I'm using Django 3.1.7's Admin form of the following model:

class EthernetInterface(models.Model):
    slug_name = models.CharField(max_length=32)
    MAC = MACAddressField(blank=True, null=True)
    lan = models.ForeignKey(LAN, on_delete=models.PROTECT, related_name='lan_interfaces')
    server_host = models.ForeignKey(ServerHost, on_delete=models.PROTECT, related_name='interfaces')
    objects = NetManager()

Admin form displays both Lan and Server host in bold letters.

When I voluntarily forget to supply a LAN object, Admin form displays a red 'This field is required' error message above LAN selection menu. This is what I expected.

When I voluntarily forget to supply a Server Host object, Django throws a RelatedObjectDoesNotExist exception. This is NOT what I expected as I expected it to display a red 'This field is required' error message.

1. Are my expectations correct ?

2. How can I debug or work around this ? (adding a specific rule in model's clean function was not effective as I think this function is called after individuals fields are checked)

Best regards

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