When having potion of invisibility.
./effect give [player] invisibility 6000 255 true
You can partially see onself (possibly a feature)
but you are invisible when seeing other maps on item frames from other chunks
Image wouldn't attach so here is imgur link.
[media]
Please check if that's still an issue for you in the latest 1.15.1 stable release or the latest 1.15.2 (pre-)release.