PostgreSQL 7.0 beta 4: Error in Insert/Select

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Michael Shepelev
Your email address : docent(at)alias(dot)ru

System Configuration
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Architecture (example: Intel Pentium) : Intel Celeron 400

Operating System (example: Linux 2.0.26 ELF) : Mandrake 7.0 RE

PostgreSQL version (example: PostgreSQL-6.5.1): PostgreSQL-7.0 beta 4

Compiler used (example: gcc 2.8.0) : gcc version 2.95.2
19991024 (release)

Please enter a FULL description of your problem:
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Sorry my english.
I found bug (IMHO) in Insert/Select Union command.
Result of SELECT UNION differs from INSERT SELECT UNION.

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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I attach an example that demonstrates this bug.

If you know how this problem might be fixed, list the solution below:
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<<bug_in_insert.tgz>>