Link within tab system suddenly not working

Uh, freaks me out why this has stopped working (not sure if this particular link ever worked).

On page: Kaarinan keskusta the first link in text: [Ladattavaan aineistopakettiin “Kaarinan keskusta - suunnitteluaineistot, 820 Mt”] should bring to this tab: (Kaarinan keskusta)

Similar setups have been working on multiple sites and now this one has stopped working. Seems that I’m incapable of finding out why. Anyone…