Fixed #35330 -- Fixed the update of related widgets when the referenced model is camel case named.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

tests/admin_views/admin.py

@@ -33,6 +33,8 @@ from .models import (
     Book,
     Bookmark,
     Box,
+    CamelCaseModel,
+    CamelCaseRelatedModel,
     Category,
     Chapter,
     ChapterXtra1,
@@ -1181,6 +1183,10 @@ class SquareAdmin(admin.ModelAdmin):
     readonly_fields = ("area",)
 
 
+class CamelCaseAdmin(admin.ModelAdmin):
+    filter_horizontal = ["m2m"]
+
+
 site = admin.AdminSite(name="admin")
 site.site_url = "/my-site-url/"
 site.register(Article, ArticleAdmin)
@@ -1305,6 +1311,8 @@ site.register(Box)
 site.register(Country, CountryAdmin)
 site.register(Traveler, TravelerAdmin)
 site.register(Square, SquareAdmin)
+site.register(CamelCaseModel)
+site.register(CamelCaseRelatedModel, CamelCaseAdmin)
 
 # Register core models we need in our tests
 site.register(User, UserAdmin)