Cities Skylines - graphic error in savegame

08.07.2021 UPDATE: last update of Node Controller Mod solved the Issue.

Hi there,
since some time i encounter an graphical bug/glitch/error when loading my savegame. The game is "drawing" blue lines starting from one point throughout the map, also there are some errors in the heights of terrain. So i delete these errors, save the game again, but the error is coming back each time loaded. Maybe someone watching has had a similar issue and may be able to give me an hint in the comments how to solve it, thx in advance.
It first appeared, after i´ve unsubscribed from some assets, that i had used as procedural objects in the city, but according to PO description if an asset is not loaded the PO just disappears.
***edit: hitting the "update whole map" button within the surface painter "healed" 90% of the blue lines, but not the terrain height.***

Mods used:
81 Tiles (Fixed for 1.2+)
Extra Landscaping Tools
Find It! 2
Harmony 2.0.4-4 (Mod Dependency)
Hide TMPE crosswalks V3.0 [stable]
Improved Public Transport 2
Intersection Marking Tool 1.7.3
Loading Screen Mod
More Beautification
More Effective Transfer Manager
Move It
Network Extensions 2 (Updated for Sunset Harbor)
Network Tiling
Node Controller Renewal 3.0.4
Realistic Population Revisited 1.4.3
Ploppable RICO Revisited 2.4.4
Ploppable Asphalt +
Procedural Objects
Prop & Tree Anarchy
Quay Anarchy
Random Tree Rotation
Roundabout Builder
Show It!
Surface Painter
TM:PE V11 STABLE (Traffic Manager: President Edition)
Ultimate Eyecandy v1.5.2
Undo It!
Unlimited Outside Connections
Unlock All + Wonders & Landmarks