My NavMesh needs to get rebuild after I reload a map

Hello everyone
I’m having a pretty anoing issue with saving a navmesh which is allready build.
For example;
I’m rebuilding navigation mesh on my pretty huge world map and it takes about 60 minutes
I disable update navigation automatically so it does not rebuild whole nav mesh everytime I restart my editor.
Then I’m spawning my AI pawn which is following me as it should and there is no problem so far,
but when I save the map and restart the editor my navMesh does not work properly and my AI is not moving at all.
I have to rebuild the whole mesh and wait for about an hour to get desired pawn following me.
Is there any solution for this, so the editor does not need to rebuild navigation mesh every time I reload the map?

Hey Hal_bregg,

This is a known issue, reported here:

and logged internally as TTP# 343863. I’ve added your notes to the bug report for our developers. Thanks for the report!

Hi Ben,
Thanks for help.

Same problem here, even with 4.5.1. Any updates to the internal ticket yet?

Not yet, the issue is still being looked into.

Hi Antonio,

It looks like this has been fixed internally, though the fix still needs testing. It won’t make it into 4.6 at this point, but will likely appear in 4.7.

Hello, Ben Halliday.

Maybe in 4.6.0?

This issue stop my game development, i’m wasting my time !!! :frowning:

Can you please show link to this issue, it on github?

I’m very-very-very waiting this fix!

Thank you very-very much for quick answer !!!