Assertion error after a case sensitivity clash

This is bzr 1.3 and bzr-svn 0.4.9 on Windows XP (Home).

I was pulling revisions in batches from a Subversion repository (python trunk) on Windows. The repository contains files whose names clash on a case-insensitive filesystem (like Windows NTFS), although they have been deleted from the latest revision. In this case I got an error when i pulled the files (something about a conflict, and one file being renamed to have a .moved suffix). I did *not* stop and resolve the conflict (this was an automated script) and later - apparently at the revision where the files get deleted - I got the following error.

For reference, the script I was using is (it's a Take Command batch script, but I hope the intent is clear)

@echo off
setlocal
echo Timings >pull_all.log
do I = 1000 to 61000 by 1000
    timer 1 on
    bzr pull --remember -r %i file:///C:/SVN/python/python/trunk
    set STR=To revision %I: %@TIMER[1]
    echo %STR
    echo %STR >>pull_all.log
    timer 1 off
enddo

------ error message

Path conflict: <deleted> / Demo/sgi/video/vinfo.py.moved
Path conflict: <deleted> / Demo/sgi/video/vtime.py.moved
Path conflict: <deleted> / Demo/sgi/video/vcopy.py.moved
bzr: ERROR: exceptions.AssertionError:

Traceback (most recent call last):
 File "bzrlib\commands.pyc", line 834, in run_bzr_catch_errors
 File "bzrlib\commands.pyc", line 790, in run_bzr
 File "bzrlib\commands.pyc", line 492, in run_argv_aliases
 File "bzrlib\builtins.pyc", line 652, in run
 File "bzrlib\decorators.pyc", line 165, in write_locked
 File "bzrlib\workingtree.pyc", line 1585, in pull
 File "bzrlib\merge.pyc", line 1198, in merge_inner
 File "bzrlib\merge.pyc", line 421, in do_merge
 File "bzrlib\merge.pyc", line 522, in do_merge
 File "bzrlib\transform.pyc", line 1198, in apply
 File "bzrlib\transform.pyc", line 1245, in _apply_removals
AssertionError

bzr 1.3 on python 2.5.2.final.0 (win32)
arguments: ['bzr', 'pull', '--remember', '-r', '38000',
'file:///C:/SVN/python/python/trunk']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
 launchpad C:\Apps\Bazaar\plugins\launchpad [unknown]
 qbzr C:\Documents and Settings\Gustav\Application
Data\bazaar\2.0\plugins\qbzr [0.8.0]
 svn C:\Documents and Settings\Gustav\Application
Data\bazaar\2.0\plugins\svn [0.4.9]
*** Bazaar has encountered an internal error.
   Please report a bug at https://bugs.launchpad.net/bzr/+filebug
   including this traceback, and a description of what you
   were doing when the error occurred.