list view doesn't load when I use json column formatting

Hi I have a following issue in Sharepoint online:

1. Create a list view with two columns grouping. It means that there are two levels of grouping.

2. Make json formatting on one column.

3. When I try to open records, it's loading, but records don't get loaded.

I think the problem is caused by json formatting because when I remove formatting records are loaded. It can't be caused by too many records because I have only 30 records in my view.

Does anyone have problems with json formatting and grouping?

Thanks,

Peter