4.16 Arrays don't use default values in a build

Development Pipeline & Plugins Editor Scripting
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I’m having trouble with porting my game to 4.16 from 4.14. Everything works fine in editor, but the game seems unable to read some array variables default values when in a build. The game breaks in very obvious ways and the log file is reporting the arrays are empty. Again, this only happens in a packaged build of the game.

Here are two snippets of the log file. The errors all look like this, and it applies to dozens of seemingly unconnected array variables from all over the game:

[2018.03.12-17.34.08:283][786]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:300][787]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:316][788]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:333][789]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:350][790]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:367][791]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:383][792]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:400][793]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:417][794]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!
[2018.03.12-17.34.08:434][795]LogScriptCore:Warning: Script Msg: Attempted to access index 1 from array Boombox_Ys of length 0!


[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!
[2018.03.12-17.34.08:454][796]LogScriptCore:Warning: Script Msg: Attempted to access index 3 from array Graphics Options Current of length 0!