for those that came here to complain about the end frame missing after deleting the dim1 folder, please be uderstanding that this might be a limitation or oversite with the mod.

a report has been made and a link to an sollution on ATM 6 page wtih a somewhat complicated solution involving copy-pasting NBT data between a new and current world

Im here to tell you that I have stubled across a more simple sollution and all it takes is just some very simple value chages to the level.data file

all you have todo are these 5 easy steps

1. Open the level.data using a NBT reading program like NBTexplorer; MAKE SURE YOUR WORLD IS NOT OPEN WHILE DOING THESE CHANGES

2. navigate to the following path
   Level.data->Data->Dragonfight

3. locate these 3 values and change them all to 0
   
   (Note: while im not sure what one does it, I feel the legacyscan is the value that causes it; also please not that altering these settings will also RESET the kill count on the Ender Dragon and may in fact result in another dragon egg from forming (unless you have another mod that changes this behavior)

4. Save the Changes and close the NBT exploring program

5. Rejoin your affected world and find that the custom frame itself has regenerated (along with a ender dragon)

I hope this has help you all. thanks for reading and have a nice day ^w^

[For the Developers}
Thankyou for making this nice and cool mod and If I had to make a recommendation to make this process easier, I would add a command that when ran it would cause the system that replaces the old frame with the new one or whatever is done to generate it to force run it