Help with Realistic Item Drops

Hello! I added the realistic item drops datapack to my server, and then removed it without running the clear all command, and now there are tons of blocks just laying around and I have no clue how to remove them. Is it possible to remove them without restarting the entire world? I reinstalled the datapack, reloaded it, and then ran the clear items function but I guess it didn't apply to the older items from the first iteration.