Meeting Their Waterloo?

What happened to the bodies of the multitudes of French, British and Prussian soldiers and horses, dying at the 1815 Battle of Waterloo, remains somewhat mysterious. One claim (reported in the London Observer, in 1822), is that the bones were later collected, ground up and turned into agricultural fertiliser for use in Belgium (https://www.theguardian.com/science/2022/jun/18/mystery-of-waterloos-dead-soldiers-to-be-re-examined-by-academics). Now fresh fieldwork (using ground radar etc) is proposed to look for any surviving burial pits in and around the site of the battlefield. I can appreciate why conversion to fertiliser would upset some people (especially those with ancestors in the conflict). However, it's only a more direct form of recycling than simple burial.