In order to see the new jetways sometimes you need to restart Couatl and/or rebuild the airport cache up to a few times.
Restarting the cache a few times" is totally useless. Once it's more than enough but, on a large airport with so many jetways, it might take a while to recreate all of them so, just wait and they'll appear.
And, it's not even normal having to recreate the cache manually (even once) to begin with, since if there's a reason to recreate it, it will happen automatically and, it's required ONLY if you change something in the Scenery Library.
However, if you have tools that rename .BGLs (like switchers, utilities, etc.), a rename cannot be detected automatically, and that's the only case when a MANUAL cache rebuild is required. Only once.