How to troubleshoot: ERROR: cache lookup failed for type?

Hello!

When reindexing a table, PostgreSQL returns the following errors for
two of its indexes:

Index foo_idx1 on foo failed with error: failed to find parent tuple
for heap-only tuple at (1162372,1) in table "foo"
Index foo_idx2 on foo failed with error: failed to find parent tuple
for heap-only tuple at (1162372,1) in table "foo"

When trying to show the tuple, there is another error message:

SET enable_indexscan = OFF;
SET enable_tidscan = OFF;
SELECT ctid, xmin, xmax, * FROM sf.dir_current_part_8 WHERE ctid =
'(1162372,1)';

ERROR: cache lookup failed for type 1769235301

Searching for oid=1769235301 in pg_class, pg_type, pg_namespace and
pg_proc returned no results.

It appears to be data corruption.
It's PostgreSQL 13 and unfortunately, data_checksums are turned off.

I would appreciate any suggestions for troubleshooting this issue.

--
Marcin Barczyński