BeautifulSoup未正确解析脚本文本/模板

我有一个相当复杂的模板脚本，BeautifulSoup4由于某种原因无法理解。正如您在下面看到的，BS4在放弃之前只对树进行了部分解析。为什么会这样，有没有办法解决？

>>> from bs4 import BeautifulSoup
>>> html = """<script id="scriptname" type="text/template"><section class="sectionname"><header><h1>Test</h1></header><table><tr><th>Title</th><td class="class"></td><th>Title</th><td class="class"></td></tr><tr><th>Title</th><td class="class"></td><th>Another row</th><td class="checksum"></td></tr></table></section></script> Other stuff I want to stay"""
>>> soup = BeautifulSoup(html)
>>> soup.findAll('script')
[<script id="scriptname" type="text/template"><section class="sectionname"><header><h1>Test</script>]

编辑：在进一步的测试中，出于某种原因，BS3似乎能够正确解析：

>>> from BeautifulSoup import BeautifulSoup as bs3
>>> soup = bs3(html)
>>> soup.script
<script id="scriptname" type="text/template"><section class="sectionname"><header><h1>Test</h1></header><table><tr><th>Title</th><td class="class"></td><th>Title</th><td class="class"></td></tr><tr><th>Title</th><td class="class"></td><th>Another row</th><td class="checksum"></td></tr></table></section></script>