Check and see if it made a cloud backup for you. It’s under previous maps and a cloud don at top right.
You could potentially open a ticket and see if support could recover it for you. Switching does cause map drift and you do have to calibrate after. If you hit relocate Yard it will definitely wipe the maps. It’s like doing a data center reinstall.
The last map save I had was from a week ago. I am just going to remap it all. I was slowly fixing all my maps anyway. was losing GPS while maping my original maps but now that the PPVS works for me it looks like it’s going to allow me to do more under my pine trees. All good.
Yes, the latest and greatest, Android 8.5 on my phone and Android 8 on my tablet. Galaxy fold 7 is a new phone (like 7 months after launch) and fully updated