I thought that I could now build something with lightning rods with that being fixed, but unfortunately, they thought that it was fixed, and I ended up with lightning rods, that are immune to water-logging.
I just flowed some water and it can't go through the lightning rods.
I can waterlog them by clicking on them with a water bucket, which is the usual method for waterlogging. In your case, they're not automatically water logging, like slabs will usually do after you waterlog one of them. You'll just have to use a water bucket on each one in the meantime.