I was able to repro it locally with any project configured for runtime navmesh generation. Loading an empty and navigation-populated maps in turns results in constant increase in navigation memory consumption.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-23023 in the post.
| 0 |
| Fix Commit | 2787038 |
|---|---|
| Main Commit | 2787214 |
| Release Commit | 2801912 |
| Created | Nov 5, 2015 |
|---|---|
| Resolved | Dec 2, 2015 |
| Updated | Apr 27, 2018 |