Prefabs breaking when upgrading Unity from 2018.3 to 2019.4

Hi guys,

So i've recently upgraded my project from 2018.3 to 2019.4 (had to because of Android API issues), and i'm finding the prefabs are broken. If I load the prefab, Unity crashes every time. If I re-export the prefab, it doesn't show any graphics - see attachment, the sprites are all there, they should be rendering fine but they don't.

Anyone have any idea what I can do?

Thanks,
Primoz

 

How would I share the project? It's a finished/production project so not exactly keen to post full source code.

Also as a side note, upgrading to different versions of Unity has different issues. I know version 2019 make the animator go wonky, and 2020 makes custom non-animator animations run at lightning speed. I always backup a copy of my project before letting Unity run it's upgrade on it.

Additionally i believe my config/manifest files may be corrupt due to another issue i'm experiencing with Unity not recognizing android API 29 even though a fresh project in same version of Unity does see it. Am happy to try deleting/resetting those if you're able to tell me how to safely do so. (Might help)

 

I managed to solve it. Turns out the NDK was either too old or too new. By editing the projectsettings file, setting targetsdkversion to 30 (while project is open), and trying to build, Unity would then realise that it can't use NDK version 19 because its too new, and it only supports NDK 16b (which it provided a link to download at). The older version of NDK i was using was v11 and too old.