Identifying parts of a transistor die
The photo is not inconsistent with the diagram - the base has been bent into a wiggly shape in order to make it as long as possible. But you can see in the diagram the contacts are on the top surface, as it is with the collector.

The base is really the "p" region in the diagram, not the metal contact on top. With more magnification you ought to be able to see two PN boundaries in the surface of the black semiconductor material.

Edit: perhaps some better pictures will help. https://zeptobars.com/en/read/NXP-PMST3904-NPN-BJT

The green circles look like base and emitter wirebonds; the shiny stuff is aluminium metal; the green is N-type and the pink is P-type.

Making the junctions longer improves their current carrying ability. Hence the zigzag shape.