Not sure how "a patch later this year most likely" became a "promise" to address the issue immediately in 126.96.36.199. Also, we don't have details here to confirm that a fix is merely "a bit of code", in LISP, etc. Our understanding is that the latest update was mainly to include the newly released compatibility with AutoCAD DWG 2018 file format.
In all likelihood, we will have several more updates to 2018 release this year. What we can say is that patches are issued based on numerous factors, including the level of interest shown by users as a whole group. With tens of thousands of users already at 2018, we are sure the development team is aware of the proper priority of each issue. As stated before, the ticket was verified so time has already been spent to log it into the system. With that we would expect, as before, "a patch later this year most likely". This isn't a promise, it's a rough assessment
Hope that clarifies.