Hi
@bazzer5707 and welcome to Dementia Support Forum. My understanding is that if the house is disregarded during the financial assessment then it cannot later be ruled back in after a person has died in order to take fees retrospectively.
However to be sure about this you could speak to the finance department at the local council. There will be a finance officer who deals specifically with financial assessments and should be able to confirm this. There may also be some guidance on the council website.
The following account of my experience is slightly different to your situation but is in effect dealing with the same point ie can care home fees be reclaimed retrospectively against a property that has been disregarded? My answer is no.
My experience was that my Mam was in a care home with dementia. She was not a self-funder but made a contribution to care costs from her pension, with the major part paid by the Local Authority. My Dad continued to live in their jointly owned home (I can't recall what type of tenancy but that was not material in the circumstances). My Mam died first and the house passed to my Dad. At that point the Local Authority had no recourse to reclaim care home fees because the house had already been disregarded (and my Dad still lived in it).
After he died it was then passed to my sister and I as part of his estate. It was sold more than a year later. Again, the Local Authority had no claim on the proceeds from sale of the house for the reason explained above. In inheriting the house my sister and I did not at the same time inherit liability for previously paid care home costs.