Database size is far larger than sum of tables, even after VACUUM FULL?

Here is my query and its output in psql, run as an admin on that database. There is a massive discrepancy between the 'total size of the database' at 50GB, and the sum of the tables, ~7MB. This is immediately after running VACUUM FULL ANALYZE table_name for every table. My understanding is that pg_total_relation_size includes the size of things like indexes, so that does not account for the discrepancy. What could be causing this?

core=# DO $$
core$# DECLARE
core$#     table_name TEXT;
core$#     db_size TEXT;
core$#     table_size TEXT;
core$#     index_size TEXT;
core$# BEGIN
core$#     -- Get the total size of the database
core$#     SELECT pg_size_pretty(pg_database_size(current_database())) INTO db_size;
core$#     RAISE NOTICE 'Total size of the database: %', db_size;
core$#     
core$#     -- Cursor to fetch table names
core$#     FOR table_name IN 
core$#         SELECT t.table_name
core$#         FROM information_schema.tables t
core$#         WHERE t.table_schema = 'public' -- Change 'public' to your schema name if it's different
core$#         AND t.table_type = 'BASE TABLE'
core$#     LOOP
core$#         -- Get the size of each table and print
core$#         EXECUTE format('SELECT pg_size_pretty(pg_total_relation_size(''%I.%I''))', 'public', table_name) INTO table_size;
core$#         RAISE NOTICE 'Table % size: %', table_name, table_size;
core$# 
core$#     END LOOP;
core$# END $$;
NOTICE:  Total size of the database: 50 GB
NOTICE:  Table table1 size: 16 kB
NOTICE:  Table table2 size: 48 kB
NOTICE:  Table table3 size: 16 kB
NOTICE:  Table table4 size: 32 kB
NOTICE:  Table table5 size: 32 kB
NOTICE:  Table table6 size: 40 kB
NOTICE:  Table table7 size: 72 kB
NOTICE:  Table table8 size: 80 kB
NOTICE:  Table table9 size: 24 kB
NOTICE:  Table table10 size: 2440 kB
NOTICE:  Table table11 size: 32 kB
NOTICE:  Table table12 size: 32 kB
NOTICE:  Table table13 size: 120 kB
NOTICE:  Table table14 size: 24 kB
NOTICE:  Table table15 size: 24 kB
NOTICE:  Table table16 size: 24 kB
NOTICE:  Table table17 size: 32 kB
NOTICE:  Table table18 size: 32 kB
NOTICE:  Table table19 size: 3352 kB
NOTICE:  Table table20 size: 40 kB
NOTICE:  Table table21 size: 144 kB
NOTICE:  Table table122 size: 24 kB
DO

It doesn't seem to be related to large objects either:

SELECT pg_size_pretty(pg_total_relation_size('pg_largeobject'));
 pg_size_pretty 
----------------
 8192 bytes