Do you mean N/A?
N/A stands for Not Applicable, which in this context just means that the dev didn't populate the changelog for v0.5.5.
Well, given the dev has a history of doing absolutely the barest of bare minimum in a 6-12 month update window just to get his patreons to keep the $2000+/month gravy train active, I believe the question is: does "N/A" for a changelog mean dev has gone full cuck and is giving fans a literal no new content "update" just to advance the version number and make it seem like they're still working on it.
The answer is no, I'm sure there is 1 or 2 new pictures and 20 or so lines of writing in the 0.5.5 update. The real changelog on Patreon mentioned they had to focus a lot of the work this 10 month update cycle on updating plugins and such; game engines aging out are a real problem when you take decades to produce a game. Fear not, just keep those dollars coming and the bread crumbs will keep dropping for years to come.