Landscape mode have the next button much much smaller than the previous and play/pause one

[Porkepix]

See screenshot below on the difference of size between the buttons

Screenshot

Device details:
Xperia XZ running Android Oreo (8.0) on stock ROM.

EDIT: I'm also unsure if we should see so few or so much at the bottom as we see here.

[enteraname74]

The issue should be the same as the previous one with the buttons overlapping on the cover.
I will work on that when I can.
For the bottom, this part should not be visible, I'm not really sure why it behaves like that on your phone, but I will work on it to find why.