After loading my save today I noticed the following error being spammed in my logs:

Exception drawing Bookcase132970: System.FieldAccessException: Field `RimWorld.Building_Bookcase:DrawOffset' is inaccessible from method `SenseOfDepthForTallBuilding.Bookcases.Patch_Building_Bokkcase:Patch_BSLBookcase (UnityEngine.Vector3,bool,RimWorld.Building_Bookcase)'

[Ref B7486437]
at RimWorld.Building_Bookcase.DrawAt (UnityEngine.Vector3 drawLoc, System.Boolean flip) [0x00226] in <630e2863bc9a4a3493f2eff01e3a9556>:0
- POSTFIX harmony.rimworld.sicafe.SenseOfDepth: Void SenseOfDepthForTallBuilding.Bookcases.Patch_Building_Bokkcase:Patch_BSLBookcase(Vector3 drawLoc, Boolean flip, Building_Bookcase __instance)
at Verse.Thing.DynamicDrawPhaseAt (Verse.DrawPhase phase, UnityEngine.Vector3 drawLoc, System.Boolean flip) [0x00004] in <630e2863bc9a4a3493f2eff01e3a9556>:0
at Verse.Thing.DynamicDrawPhase (Verse.DrawPhase phase) [0x00017] in <630e2863bc9a4a3493f2eff01e3a9556>:0
at Verse.DynamicDrawManager.DrawDynamicThings () [0x000ec] in <630e2863bc9a4a3493f2eff01e3a9556>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
Verse.DynamicDrawManager:DrawDynamicThings ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Map.MapUpdate_Patch1 (Verse.Map)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.UpdatePlay_Patch1 (Verse.Game)
Verse.Root_Play:Update ()

Books that were placed in the upper section (the bookcase being placed 1x2) were not visible. Destroying the bookcase stopped the spam, but it resumed once I placed another. Not sure if it affects anything, but I'm also using the Ponpeco Furniture: School Desk retexture for the desk. I've disabled the mod for the time being.