makssent commented on issue #36462:
URL: 
https://github.com/apache/shardingsphere/issues/36462#issuecomment-3250132345

   The issue is most likely related to the difference in how tables are loaded.
   In `broadcastTables`, based on my assumption (I haven’t checked the code 
yet), only the tables we explicitly specify are loaded.
   In `!SINGLE`, however, we can define a default data source or use wildcards 
to include all tables. That’s why the system-table check is applied here, but 
as a side effect it also filters out valid user tables.
   
   ```YAML
   - !SINGLE
     tables:
       - ds_0.R$TABLE
       - ds_0.r$table
       - ds_0.*.*
       - "*.*"
       - "*.*.*"
     defaultDataSource: ds_0
   ```
   


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