Is there no air filter available for this model after 2012? Or is it the same part for as a different variant?

It looks like you need the below: 4241 140 4404 - Air Filter - https://www.lsengineers.co.uk/air-filter-for-stihl-bg86-bg86-c-e-blower-oem-no-4241-140-4404.html