@Ukisgaslit FYI
These quotes are taken from the Governments website and apply to the Crown Estate, but equally be apply to the Duchies. A decision is made once it becomes clear that the asset has no known owner:
"Asset disposal
If an asset becomes bona vacantia it belongs to the Crown. The Crown does not have to deal with it in any particular way. Normally an asset will either be disclaimed or sold for full market value."
"The power of disclaimer is important and exercised frequently in relation to bona vacantia land because it protects the Crown, and therefore the taxpayer, from liability."
This is not an unusual situation at all.
The decision to disclaim or transfer to Wigan Council will be made by the Duchy Council in collaboration with Wigan Council, and will not be decided by King Charles as you have suggested in your post. It is not his decision to make.
Also, the Duchy has offered to discuss terms of the land transfer with Wigan Council so it is not a case of the Duchy dumping it on Wigan. This is, as I have said before, just typical journalists making mountains out of molehills to sell their papers.
Finally, any proceeds from the sale of bona vacantia land that is received by the Duchy is used for the upkeep of the many historic properties that it already owns (whether in Lancaster or anywhere else), or for other charitable purposes. It does not end up in the pocket of King Charles.