so Unfortunately in rigify metarigs that use bendy bones (in my case tentacle) HAVE to be straight, i could have sworn it somehow worked with bent bone, but after numerous attempts i just couldnt replicate that...

Unfortunately, in Rigify metarigs that use Bendy Bones (in my case, a tentacle), the bones must be straight. Earlier attempts suggested it might work with a bent bone, but I was unable to replicate the result.