I've already opened an issue on Stardust Fragment's github page, but it also happens when using SimplEnergy. The exact same thing I described for StardustFragment happens with SimplEnergy, with the exception of the chat message, but I'm not sure if it's supposed to have one.
[10:58:46] [Render thread/ERROR]: Couldn't load tag smithed.custom_block:event/on_place as it is missing following references: simplenergy:place/ (from file/simplenergy-datapack.zip)
[10:58:46] [Render thread/ERROR]: Couldn't load tag simplenergy:load/main as it is missing following references: simplenergy:load/ (from file/simplenergy-datapack.zip)
[10:58:46] [Render thread/ERROR]: Couldn't load tag load:load as it is missing following references: #simplenergy:load/main (from file/simplenergy-datapack.zip)