Buffout 4 changes the behavior of Keywords used in Workshop menus

In Fallout 4, Workshop Menus are comprised of FormList and Keyword objects, with the structure primarily dictated by FormList objects and additional data and structure provided by Keywords. The use of FormLists in this context is straightforward and self explanatory, but Keywords have two separate uses that do not overlap in unmodified Fallout 4:

• A Keyword that is used as a recipe filter for COBJ records will provide a leaf menu when included in a Workshop FormList, opening up to display all items made available to craft via the COBJ recipes and conditions.
• A Keyword in the first slot (index 0) of a Workshop FormList is used to provide that FormList's menu with a name, and in the event that the Keyword is associated with an ArtObject, to provide that menu with an icon.

The second behavior is used for every menu except WorkshopMenuMain, which has no need for an icon or name due to never appearing in another menu. Thus far, all behaviors mentioned remain unchanged while using Buffout 4. However, there is another behavior associated with the second Keyword type, that is removed when the Buffout 4 workshop menu fix is enabled. In the base game, the Keywords used in index zero of a Workshop FormList (aside from WorkshopMenuMain) will have the leaf menu functionality suppressed.

This can be clearly demonstrated via "WorkshopRecipeFilterDecor "Decorations" [KYWD:0006D5A3]", which has a duplicate mattress recipe associated with it. In the base game, this mattress recipe is completely inaccessible unless a mod changes the recipe's filter Keyword. However, with the Buffout 4 workshop menu patch enabled, the recipe becomes accessible via a new leaf menu, "Decorations > Decorations", in which it is the only item.

This is an issue that has an available mod patch, and has been rejected for patching by the Unofficial Fallout 4 Patch due to only becoming visible via code injection. I filed a bug report on the main Buffout 4 tracker, and it was rejected by Fudgyduff as "Won't Fix", citing the leaf menu at the start of WorkshopMenuMain as proof that Keywords only have one behavior in Workshop menus, and appearances to the contrary are likely bugs in Bethesda's code.

This difference in behavior can result in mods that lose menus if developed by authors utilizing the fix and used by players who don't use Buffout 4 (or if ported to console). It can also result in mods gaining undesired menus if developed by authors who do not utilize Buffout 4 and used by players who do.

I am mostly filing this issue to help create a searchable trail, so anyone affected by it will be able to identify the cause, and potentially adjust mods accordingly. Ideally, I feel this is a behavior that should be reimplemented so that Buffout 4 and the base game treat Workshop menus in the same way, but I do not know whether this is an intentional or unintentional change since it is not documented by Buffout 4's settings or public changelogs.