postmaster errors with index on temp table?

Is this a known problem?

pjw=# create temporary table tt(f int4);
CREATE
pjw=# create index tt_ix1 on tt(f);
CREATE
pjw=# \q

The postmaster says:

NOTICE: mdopen: couldn't open pg_temp.31633.1: No such file or directory
pq_flush: send() failed: Bad file descriptor
NOTICE: RelationIdBuildRelation: smgropen(pg_temp.31633.1): Bad file
descriptor
pq_flush: send() failed: Bad file descriptor

It only happens if you create an index on a temporary table...

P.S. Searching in the mail archives is still timing out...so if I've missed
a related thread, sorry.

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