I actually work to avoid exactly this because I hate this rule.
The rule is that if the same person is talking, you don’t have an end quote between paragraphs, but you do have a begin quote at the begining of the paragraph. This rule has always bothered me.
So, while there are two quote marks missing, the one I need to replace is the one before “They are very strong” and I need to leave out the trailing one in the paragraph above.
They do this so you don’t have to re-identify the speaker with a “said” but it still bugs me.