P3D5 has updated A LOT of default airports and, because of this, if a scenery came with an Exclude file made for 4.5 ( which uses a database that hasn't changed from 2006 ), it will likely not work with V5.
This because lots of developers ( including us, our older sceneries ), have used in the past the "micro-exclude" method, to fix an old bug that is still there from FSX times, that if you created a "global" exclude, it would end up excluding even jetways from the scenery own layer, not only the ones below it ( as it should be ). The way to fix this, was to create many small micro excludes, centered around every object of the default scenery.
This wasn't ideal, because it added a whole new set of problems, like seeing double objects if you had another scenery for the same airport that wasn't default, but at least allowed jetway to work.
This affects only default jetways, SODE/GSX are entirely unaffected by this bug so, in our later sceneries that always came with GSX/SODE jetways, we stopped using the micro-exclude method and when P3D V5 came out, we also updated almost all our AFCADs to use the single exclude method, and in some cases ( PHNL, for example ), we replaced its default jetways with GSX/SODE version, to prevent the bug from happening without using a micro-exclude.
So, basically, every scenery that was made with the micro-exclude method, will likely have to be updated by the developer, because the default scenery has been updated.