Retrieve threaded list of .bin file

I'm programming in C and I have a code that uses a 50-position sequential list to store the first address of several linked lists in each of their spaces, so that's fine, the problem is when I fill in the list and write to a .bin file, because at the time of recovering the data from the file to the software, I only get the contents of the sequential lists and the list of the linked lists are lost, I believe it is because at the moment I do the data recovery, the old addresses that were occupied by the linked lists are no longer available in the same sequence as they were at the time I recorded the file, could someone confirm to me if this is really the problem and if there is a solution?