Thanks for responding, everyone! I am new to particles and Niagara, so it’s probably all due to me not knowing enough, but this completely put my project on hold, so I am very anxious to find a solution. I am glad to not be the only one who encountered this 
By the way, I am using UE 4.27 for this project because it’s fairly large and UE5 is just too slow. So it’s not just a UE5 bug, sadly… I haven’t found a solution yet and will keep on trying, maybe someone out there figures it out.