You can see in the top photo in the row with 2 hearts (second row up from bottom).
I took a scrap of the shawl yarn threaded a needle, then worked into the spot where the top left cluster meets the bottom cluster on that heart and ran the needle under the last stitch up top (leaving half the tail handing out), looped around the chain, then worked into the top of the first/last stitch of the bottom cluster. I held the 'fix' yarn firmly, and gave the shawl a few tugs so the chain could slide to where it needed to be for the heart shape. I then worked the end of the yarn up into the top cluster knotted it off and secured
red it along all 4 stitches and hid my tails.