Shared Target Style

Question

I am not sure where I need to suggest bugs:

I have logged a few issues on the GitHub location (https://github.com/plantuml/plantuml), but it looks like most of the activity and resolution is in this forum?

At the risk of being chastised, let me try this forum for the same issues I logged there (and I'll continue using the medium that works):
https://github.com/plantuml/plantuml/issues/97

The problem (bug) is that when I turn on shared target style for implementation (dotted lines), the dotted lines become solid:

@startuml

skinparam groupInheritance 2
skinparam linetype poly
hide empty members

class B implements A
class C implements A
class Q extends P
class R extends P

class Concrete implements Abstract

@enduml

The visualization from Concrete to Abstract correctly shows a dotted line.

The visualization from B and C into A show the shared target style, but the dotted lines are now solid...

Also note that the grouping does NOT work when using linetype ortho, which is another bug.

BUG1: Implementation dotted lines become solid when grouping.
BUG2: Grouping doesn't work with linetype ortho.

Comments

I have tried to work around this by using objects or rectangles, but for that scenario, I stumble into a different bug: the arrows on the generalization end simply disappear now...  The associations do get grouped though.

BUG3: Visualization of arrow end disappears for generalization with objects or rectangles.