Follow-up Comment #1, bug #524 (project tex4ht):
Thanks for the report. I am not sure why it doesn't produce error in $ or $$,
but it is really advisable to use proper grouping for sub- and superscripts
with TeX4ht.
Alternatively, you can use the "pic-align" option. It will produce images for
align and few others environments, and it doesn't fail with errors.
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