My Nokia Blog published Nokia N8 disassembly where both front and rear side camera modules are seen. The front camera module looks like surface mounted Omnivision's CameraCube.
Thanks to J.S. who noticed this and sent me the link!
Update: It looks like I jumped to Omnivision conclusion too fast - there are other possible options, as said in comments. The original N8 internals pictures are on FCC site. The photos are dated by April 1, 2020 - hope government agencies do not joke and this is the only mistake in this doc.