you can see the new options here: https://minecraft.gamepedia.com/Dimension; after change the type json in datapack you can load the dimensions with no problem
however I didn't found the correct value of "infiniburn", and also didn't understand the meaning of "logical_height" and "piglin_safe"
see the log then you will find that there are several new options in jsons of "dimension_type"
When I change the type in the define of dimension the_end in datapack of my server, I can make the end back to the normal light, but after I changed the type the end portal in the end will send me back to the end.
If you put an end portal at 0,~,0 in the type changed end, it will even cause a deadlock with endless loop teleport.
I have said this is not a duplicate of MC-187434, this issue is not like MC-187434 which is solved. THIS IS A ISSUE WAITING TO BE RESOLVED!