Load / unload Stream level crash

Build Type: Binary Unreal Launcher

Build version: 4.14.3-3249277+++UE4+Release-4.14

Detailed description of the issue:
Got stuck in a big project where we used Lighting Scenario’s to easily switch styles in an apartment. Everything works like a charm in PIE mode, but unloading/loading these streamed levels crash in standalone or packaged version. Happens 100% of the time.

Decided to test the matter in a new project to limit influencing factors. Started from the first person controller template and made the most simple lighting scenario switch I could imagine. Works in PIE. Crashes in standalone. 100% of the time.

Added testproject as Attachment Link

Basically unloading + loading another streamed sublevel set to lighting Scenario, in one blueprint call, crashes 100% in standalone…

Screenshots/Link to video:

126313-loadstreamlevel_bug_scr02.png

Repro Steps

Action 1: Create New project from First Person Blueprint template

Action 2: Create 2 new levels, add a mesh in each in a different position, add them as sub-levels to the default persistent level, set as lighting scenario, and build lighting separately for each scenario.

Action 3: Use Load Stream Level and Unload Stream level in one blueprint event. (level blueprint or any actor or UMG blueprint is fine).

Action4: run in standalone mode, activate above blueprint event–>crash.

Attachments:
[sample project download link][3]

Im having the same problem.
Looks like it is a known issue and is going to be fixed in 4.15

Hey KNote & Magruun,

This is correct, the issue has been reported as fixed for 4.15. You can also grab the fix commit and merge it into your engine if you are using a source build.

Thank you for your report

Have a great day