While conceeding that to some this is only a matter of taste, I would generally argue for holding to html 4.01-style standards in the matter of nesting.

Therefore, coercing proper nexting seems an appropriate behavior. Moreover, it would spare the reader the grayed-out </b> reminders/error/warnings exhibited when the user has troubled to turn on the Monastery's checking HTML Related Options.

OTOH, formatting across code blocks (such as you showed, anyway) seems a reasonable departure from what I understand to be the standard and thus likewise seems to me appropriate here.