Cross-DB query using temp doesn't work

[danderson]

Porting from modernc.org/sqlite to this package, one of my queries fail preparation, where it executed without issue on modernc:

sqlite.Prepare: SQLITE_ERROR: no such table: temp.seen (DELETE FROM dirty WHERE NOT EXISTS (SELECT 1 FROM temp.seen WHERE temp.seen.path = dirty.path))

Schema, for context:

CREATE TABLE IF NOT EXISTS dirty (
  id INTEGER PRIMARY KEY,
  path TEXT,
  mtime DATETIME,
  size INTEGER,
  dev INTEGER,
  inode INTEGER,
  canread INTEGER,

  dirty INTEGER
);

CREATE TEMPORARY TABLE temp.seen (path TEXT);

afaict, queries across regular and temporary tables should Just Work, but something about how this package sets things up makes it unable to query temporary tables in the same query as a non-temporary table (other queries that only touch the temporary table or non-temporary table work fine).