Could not find table/view VIEW_COLUMNS in schema PUBLIC

Hello,

For no particular reason I cannot access anymore the public synonym 'VIEW_COLUMNS' with any user. (even with SYSTEM)

All other synonyms remain accessible.

Here the errors I get:

select * from  PUBLIC.VIEW_COLUMNS;

11:37:17 (SQL Editor) Could not execute 'select * from PUBLIC.VIEW_COLUMNS' Error: (dberror) 259 - invalid table name: Could not find table/view VIEW_COLUMNS in schema PUBLIC: line 1 col 22 (at pos 22)

But the following queries return appropriate values:

select * from  SYS.VIEW_COLUMNS; -- is Ok

select * from "PUBLIC"."SYNONYMS" where synonym_name = 'VIEW_COLUMNS';

Others synonyms are still accessible:

select * from  PUBLIC.VIEWS; -- is OK

select * from  PUBLIC.USERS; -- is OK

When trying to recreate the synonym :

CREATE PUBLIC SYNONYM VIEW_COLUMNS FOR "SYS"."VIEW_COLUMNS"

11:49:39 (SQL Editor) Could not execute 'CREATE PUBLIC SYNONYM VIEW_COLUMNS FOR "SYS"."VIEW_COLUMNS"' Error: (dberror) 330 - cannot use duplicate synonym name: VIEW_COLUMNS: line 1 col 22 (at pos 22)

I cannot access the admin console from hana studio because of this error too.

I deleted all custom config files and restart but the error persists.

What is happening?!

Thank you