Don't worry about it; I dug out huge peony that was dormant for decades, did not know it was there till it popped out of a Lily of the Valley garden some years back and got so big it was dominating the garden.
I dug it out last fall and gave it, the chunks to a cousin's wife.
They seem to be thriving at her place so far,
Well as I have found out over the past few decades, peonies can become weeds as despite digging deep and hopefully getting it all out, it is still there and looks quite healthy.
I am going to dig it out and roto-till the whole bed, mom's wild roses, she got them from a road ditch are also spreading like crazy in the same bed.
That said, I have three other peonies I DID PLANT some years back and they looked good till one year three stopped blooming and now no matter what I do, I cannot get two to bloom.
I might did them up and toss them in the Lily of the Valley bed as I KNOW they will bloom there because I do not want them there.
In reality if they do not bloom this year I will dig them up and cut the bottom of the roots off to about one-half foot then replant.