I'm on 4.17.2 and a gold subscriber.
I can confirm that when i toggle in the side bar, offline poi. With an offline map (your lomap as and example) the points appear and disappear as expected.
When I use an online map again your own supplied map as an example, toggling offline poi doesn't allow them to appear.
An example area with many historic mine adits and shafts.
N 54° 41.980', W 003° 04.946'
J
I can confirm that when i toggle in the side bar, offline poi. With an offline map (your lomap as and example) the points appear and disappear as expected.
When I use an online map again your own supplied map as an example, toggling offline poi doesn't allow them to appear.
An example area with many historic mine adits and shafts.
N 54° 41.980', W 003° 04.946'
J