Chaining not working in inlines in ChainedManyToManyField with horizontal=True parameter

[KaktusOnFire]

Checklist

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• This issue is not about installing previous versions of django-smart-selects older than 1.2.8. I understand that previous versions are insecure and will not receive any support whatsoever.
• I have verified that that issue exists against the master branch of django-smart-selects.
• I have debugged the issue to the smart_selects app.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• I have reduced the issue to the simplest possible case.
• I have included all relevant sections of models.py, forms.py, and views.py with problems.
• I have used GitHub Flavored Markdown to style all of my posted code.

Steps to reproduce

1. Create inline
2. Add chainedmanytomany field with horizontal=True parameter
3. Try to pick any of ProductGroup values

Actual behavior

Get chained values only for product and tariff
p.s. everything works OK ONLY when i'm press save and trying to change EXISTING object

Expected behavior

Get chained values for product, tariff and discounts

Model structure

    product_group = models.ForeignKey(ProductGroup, on_delete=models.RESTRICT, default=None, null=True)
    product = ChainedForeignKey(Product,
                                chained_field="product_group",
                                chained_model_field="product_group",
                                show_all=False,
                                auto_choose=True,
                                sort=True,
                                default=None
                                )
    tariff = ChainedForeignKey("Tariff",
                               chained_field="product_group",
                               chained_model_field="product_group",
                               show_all=False,
                               auto_choose=True,
                               sort=True,
                               default=None
                               )
    discounts = ChainedManyToManyField("Discount",
                                       chained_field="product_group",
                                       chained_model_field="product_groups",
                                       default=None,
                                       blank=True,
                                       )

Console log after picking ProductGroup value

2023-06-15 16:38:11 | INFO/MainProcess | "GET /chaining/filter/crm/Tariff/product_group/crm/UserInvoiceItem/tariff/68/ HTTP/1.1" 200 286
2023-06-15 16:38:11 | INFO/MainProcess | "GET /chaining/filter/crm/Product/product_group/crm/UserInvoiceItem/product/68/ HTTP/1.1" 200 1071

Log should contains request for discounts field, but its not.

[KaktusOnFire]

Any suggestions?