There are still graphical issues with gentryii heads in 5.1.1.alpha.2020-10-16.
If you place a gentryii, then place down one chain, then continue trying to place a second anchor point in the opposite direction, but where the chain extends from the head in a different direction, the head will be at the wrong angle. See the first two images of the below screenshot.
But there is another issue. Place a gentryii as just a head. Then reselect the gentryii to give it a chain, and it will choose the wrong angle when you place its new chain (see the third image).