A small update from me:
As mentioned above I had some troubles with this 3.12" oled display from Aliexpress - Ver: 2.1.
At first boot it worked like a charm, but changing to "List" or any other page on the DED made the display go black. Looked like there were some kind of issue where some of the letters or numbers did not fit into the panel (tried to record it in slow motion from my phone).
I deleted the font in the code, and added the standard font from the library. Now, everything works expect there is some minor bugs with some of the letters like degrees on NAV page.
Will update this post if I find any suitable font for this display.
Short update:
Did not find any solution on the font, but found out that this Ver 2.1 SSD1332 display has an active area of that is smaller than the one from Buydisplay. Anyone got any input?