Django search in Postgresql db_collation field

I’m using Django and DRF searchFilter, which allows me to add fields to the view’s ‘search_fields’ to allow searching in them.
Django version is 3.2 (will probably upgrade to 4.2) and DRF version 3.12.2.
Lately I’ve added a new field of type CharField with a db_collation of case_insensitive. I need that field to be case-insensitive and I understood that Postgres will stop supporting CI field and the recommendation is using db_collation. It did work until I wanted to support searching in that field. After adding that new field to the ‘search_fields’ of the view and trying searching, I got this error message –

 File ".../lib/python3.7/site-packages/django/db/backends/utils.py", line 84, in _execute
return self.cursor.execute(sql, params) 
django.db.utils.NotSupportedError: nondeterministic collations are not supported for LIKE

Is there a pre-prepared solution for that?
I couldn’t find any and I find it weird that Postgres enforce using db_collation but doesn’t support LIKE in it.

This is the field definition in the model –

custom_field = models.CharField(db_collation="case_insensitive", db_index=True, max_length=100, null=True)

This is the collation definition –

[
    CreateCollation(
        "case_insensitive",
        provider="icu",
        locale="und-u-ks-level2-kn-true",
        deterministic=False,
    ),
]