Losing directional skills, for example forgetting the way to somewhere very familiar or not recognising an often-used route
That happened to my mother. I first realised when my dad died, and we had to sort out funeral arrangements etc. She didn't know the way to anywhere and I had to buy a satnav to navigate round Milton Keynes.
She couldn't find her way to the nearest Sainsburys, which she'd walked at least once a week for 20+ years and only involved 3 junctions.
She also developed something the doctor referred to as "visual agnosia", which may have had something to do with it. Apparently, although you can see fine, your brain can't make sense of what you see. She used to ring me up to ask me the time, claiming the clock was broken and she couldn't find her watch. I got a new clock for the kitchen, and it became apparent that she couldn't tell the time any more.
I was also told that people with dementia often revert to having anxiety about things that were problems when they were much younger, usually early 20s. When my parents were first married, at 21, they were very hard up for a few years and in her last years she got obsessed with having no money, when she actually had over £20k in the bank.
Numbers and spatial relationships completely foxed her. Watching her trying to change the height of the oven shelf was heartbreaking, she just couldn't get it level. And she couldn't do up buttons properly, it as though she saw everything all skew-whiff.