Hi,
When I delete ordinary pipes from the map in my game, they are disappearing from my game completely. If I disable this mod, then I get the behaviour that I would expect, i.e. they are added back into my bag, when I delete them from the map.
I don't know if this happens for anything else, but I am talking about standard game pipes, not the ones created by this mod. I think this may be a recent change in behaviour because I've been happily using this mod for ages and not noticed it before. Maybe it's a conflict with some other mods?
Here's a save, in case you can't reproduce it:
https://drive.google.com/file/d/1SVngN-ijtrtilZhz6rxQxs6PZzjL9b5a/view?usp=sharing
Thanks!