Does hiding in dead bodies work against enemies?
Bodies are client-side rendered.
There are lots of rants about them and also barricade debris for the entire existence of Siege (dates are as late as early 2019). For example, here is reddit thread: https://www.reddit.com/r/Rainbow6/comments/7oide9/clientside_dead_bodies_a_brief_rant/
Here is another one from Ubisoft forums, where community manager seems to admit the issue: https://forums.ubi.com/showthread.php/1867443-Client-side-bodies-and-issues-with-it