So interesting developmentā¦ I find this in the logs! Eleon calls me a cheater!! 
122-20:23:23.379 12_23 -ERR- Prefab is not allowed to be spawned - cheated?
22-20:23:30.465 12_23 -ERR- Prefab is not allowed to be spawned - cheated?
22-20:23:36.385 12_23 -ERR- Prefab is not allowed to be spawned - cheated?
22-20:23:53.587 12_23 -ERR- Prefab is not allowed to be spawned - cheated?
22-20:24:21.965 12_24 -ERR- Prefab is not allowed to be spawned - cheated?
See the goods in the onedrive link below:
https://1drv.ms/f/s!Ai0BnRG0AFfigm-4AgBYd4uUq0xQ
Note the video demonstrates several BPs that fail ā These appear to be Workshop BPs not custom BPs. Custom BPs work fine.,