I don't know. It's really vivid for me. The sound of it, way the weather smells, even the texture of things like stone and sand. It's way easier to focus on generating those sensations and experiences than trying to hold boring things in my thoughts. But to be fair, most of the specifics are from things I know in real life. Like shale - you known what it feels like, how it slides, sounds and how it breaks apart, so it's calling up memories and using that re-experiencing of the memory to make something new. And my long term memory is narrative not semantic maybe that makes a difference.

I think what you can do depends a lot on where your deficit is. My deficit is in working memory - that means I can't hold new information in my thoughts and manipulate it at the same time - like not being able to add a sequence of numbers as they are being read to you. Or being able to argue intelligently. My semantic memory is shitty but not abnormally so.

Maybe you have a different memory glitch than I do. Can you evoke senses when you are thinking about your lottery win (like the new car smell, or the sounds of waves that surround your newly purchased island?) Or is in an intellectual exercise? Do you remember facts better than context? If so, yours is predominately semantic memory - maybe you can't generate senses because your memory isn't storing them with much detail - in which case when you are storing the memory of the daydream, you're not storing the detail needed to create a world, just that it happened.

Semantic memory is way better for succeeding at work though. Have you tried fidget toys? They are new management training thingy de jour so no one will think oddly of you having them at work.

Tldr I don't know so here's a wall of text.