May I interest you in a (not toilet) paper I skimmed back when Covid was still a bigger issue? doi.org/10.1063/5.0013318
In another, newer, paper (again, not the toilet kind of paper) I just found, researchers basically used lasers to see and analyze the spread of aerosol plumes after flushing: doi.org/10.1038/s41598-022-24686-5