I didn't try to reproduce the bug, but I think that
(lambda (line id condition)
(indium-breakpoint-added id ov))
in indium-breakpoint-add can't work in narrowed buffers because line-number-at-pos return the narrowed line number. I submitted a patch to Emacs, but it hasn't been merged yet :-).
changed the description
It's been merged in Emacs master :rocket:
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