Haven’t been to any of the farms today but what I noticed, might be related.
Earlier, I was replacing Iron beams and posts with Titanium Beams and posts. I’d smash an Iron beam, place a Titanium beam and I got the warning tool tip that usually shows up when you smash a block and put the exact one back again. I got no xp for any of the Titanium beams or posts that I put down in place of the Iron ones. But if I placed them elsewhere, where there had been no beams or posts, I got the xp.
Iron beams and posts aren’t Titanium beams and posts. So, could be a related bug?