Submitted by: @mrotteveel

An unprivileged user (as in: newly created, nothing explicitly granted), is unable to see their own context variables in MON$CONTEXT_VARIABLES.

Steps to reproduce:

1. As SYSDBA create a new user:
create user someuser password 'somepassword';
2. Connect to a database with that user:
connect 'localhost:e:/db/somedatabase.fdb' user someuser password 'somepassword';
3. Add a context variable
select rdb$set_context('USER_SESSION', 'owned_by_someuser', 'true') from rdb$database;
4. Query MON$CONTEXT_VARIABLES
select mon$attachment_id, mon$transaction_id, mon$variable_name, mon$variable_value from mon$context_variables;

Expected: 1 row with variable name 'owned_by_someuser' and value 'true'
Actual behaviour: no row shown

Firebird 3.0.6 behaves as expected.