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Child actor function doesn't work after editor restart [Demo project]

This bug appeared in 4.11 (in 4.10 it works). When adding Child Actor Component in Construction Script in 'A' blueprint and calling any function/changing variable from this child, it won't fire after editor restart. After recompiling the 'A' blueprint, it goes back to normal.

I've created a simple project that demonstrates this bug: https://www.dropbox.com/s/b9m5rv92iaykjwn/Bug411.zip?dl=0

alt text

Please help, I can't update my Marketplace product to 4.11 because of this bug :(

Maybe there is some workaround?

Product Version: UE 4.11
411bug.jpg (103.9 kB)
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asked Apr 01 '16 at 06:49 PM in Bug Reports

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2 answers: sort voted first

Thank you for the compact repro case. I've identified the cause and submitted the fix to the Release branch for hotfix 4.11.2. If you are building your own engine code the fix is simple to apply and you could pull the fix from github now:


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answered Apr 07 '16 at 05:05 PM

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Marc Audy STAFF
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avatar image Slavq Apr 07 '16 at 05:14 PM

That's awesome, thank you! (I need to wait for official 4.11.2 hotfix though, because in my case it's for my Marketplace item)

avatar image BPANDREW Apr 09 '16 at 01:05 PM

i dont think this was a proper fix, it works on map load now, but after one blueprint compile, it breaks again

avatar image Adam Davis STAFF Apr 09 '16 at 07:28 PM


Removed initial post after rereading and re-testing. I was able to reproduce this and have updated UE-29007 to reflect this change in the bug.

avatar image BPANDREW May 10 '16 at 10:57 AM

i still have this issue randomly happen - its not longer a show stopper for me.. but I think theres still something to be sorted out - maybe its fixed in 4.12?

avatar image Adam Davis STAFF May 10 '16 at 01:41 PM


Do you have a sample project this is occurring in I can take a look at in 4.12?

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Hi Slavq,

I was able to reproduce this on my end and have entered a bug report, UE-29007, to be assessed by the development staff.

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answered Apr 01 '16 at 07:56 PM

avatar image Slavq Apr 01 '16 at 09:49 PM

Thanks, I hope that it can be fixed soon, because I can't find any workaround...

I also have some additional info:

1 - Nothing works on child actor after restart, even directly setting its variables:

alt text

... So it's not only about functions, but everything!

2 - Even just moving the actor after restart (or forcing it to execute Construction Script in another way) causes proper child actor behavior, without need to recompile it (which unfortunately can't be used for workaround) So the bug occurs only right after editor restart.

411bug2.jpg (107.8 kB)
avatar image Xonos Apr 04 '16 at 08:44 PM

I am also having this issue. Additionally - after upgrading to 4.11 - The forest maker does not work with multiple landscapes. It is not placing trees to the nearest landscape below the blueprint actor. It's placing them on the landscape below the landscape.

avatar image Slavq Apr 04 '16 at 09:43 PM

Thanks for reporting in! I really hope that they will fix it for 4.11.1

Regarding ForestMaker issue, please contact me on contact@unknown-origins.com and I'll help you from there. For the start, try to move your ForestMaker actor in editor or change something in its properties. In my 4.11 project, it spawns trees correctly, always at the first detected surface below.

avatar image Slavq Apr 06 '16 at 11:47 AM

Seems like more people are affected by this bug, here's another example demonstrating this issue by user @BPANDREW : https://www.youtube.com/watch?v=4jfW_fLHTg0

+ Important note: This bug occurs not only after editor restart, but after every map load.

avatar image pyropace Apr 06 '16 at 07:23 PM

I am having this issue as well


avatar image SONB Apr 06 '16 at 11:19 PM

Same issue here.

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