Attempting to remove the ejection pipe connection to the block on the right in the following image. It will not remove. I can right click and both connections get a red X but that is about it.

v103
1.12.2-forge1.12.2-14.23.1.2554

https://imgur.com/a/TsmJ0

sneak & empty hand?
Probably the torches in your offhand block the operation

Yes it was the torches, thanks.