THIS ONLY APPLIES TO THE PHANTOM 4 PRO PLUS
I was able to duplicate this issue.
I don't use my Plus controller very often.
Usually, I'll use my Pro 4 controller / iPad combo.
Saw your post again this morning and grabbed my Plus and linked it to see if I could duplicate / resolve this issue.
First 2 pics (below) were after linking.
Maps were blank on mine also?? Uh oh.
Time to troubleshoot.
Click the DJI on top left.
Went to maps menu (DJI GO 4, main page), fourth icon, top left.
Downloaded the area maps where I'm at.
Restarted. All good. Got the maps (last 2 pics).
I had to poke the bear!
Here's where I thought I really messed up......
Went back to maps menu and thought I'd delete the downloaded maps and repeat the process.. Just to be sure this all worked correctly.
On my downloaded maps page (again, in DJI GO 4), I saw that there were duplicates of the downloaded maps of my area.
Deleted them both.
Restarted.
Attempted to download maps again.
Download would start, then get stuck at 47%.
Cancelled, restarted, waited. Rinse / repeat, etc.
No luck getting maps to download (would continually stick at 47%) and now my maps page would only show the GEO areas but no streets.
Slight panic mode thinking I just put myself in your boat.
Went through all menus I could think of on remote.
Attached drone to DJI Assistant 2 on PC.
Synced, checked for updates.
Still no maps.
Here's the fix (was for me anyway).
Place finger top / middle of Pro Plus controller screen.
Swipe down. Should see the Volume and Brightness menu.
Below that, I had a box saying an update for DJI GO 4 was available, version V4.3.14 (8-dpad)
Downloaded the new DJI GO 4 app.
Followed all the installation instructions after the download.
Restart.
Maps returned right away!
This means they were coming thru wifi.
Downloaded my area maps again.
This time, the download did not hesitate and went right through to completion at 100%.
Learned something today.
Even though I thought all my firmware and software were current, they were not.
The usual menu I see after start up (MC Menu) and the Systems Settings (then Update) menu on DJI GO 4, do not tell you if there is a new version of DJI GO 4.
After the update, I'm all good again.
Hope this helps.
Anyone with the Standard
Phantom 4 Pro controller (GL300F), pay no attention to any of the above.
THIS ONLY APPLIES TO THE PHANTOM 4 PRO PLUS - (GL300E) remote controller.
They are two different animals.