Different guids for each Sunflower in your journal.
I have two so those are included in the updated code above (copy/paste and create a new addon to replace your current one). If you have more Sunflowers or one that is not one of these (there's usually a max. of 3 of any one type of pet...I think (not a pet person)), you will have to find/add it's guid.
With the flower that isn't singing properly summoned, you should be able to
Code:
/run print(C_PetJournal.GetSummonedPetGUID())
and copy that into a new entry in the guids table (insert a new line)
Code:
["xxxxxxxx"] = true,
where xxxxxxxx is the guid.
Copy one of the ones already there and you probably only have to change the last one or two numbers.