Route command doesn't work properly anymore

[Marcel510]

Browser: Chrome 64.0.3282.167

Airport: LSZH https://openscope-dev-pr-839.herokuapp.com/

Approximate play time before issue: -

Issue Description

Incorrect routing

Steps to reproduce

f.e. this happens with aircraft with the following route: "LSZH28.DEGES2W.DEGES.Z1.SUDEN"

• enter "XXXXX route DEGES..MINGA" short after departure

Then you can see a really weird routing:

Note that _RWY28KLO03DME _KLO253005 ZH552 _KLO232005 KLO MOMOL KOLUL ZH504 ZH525 are the fixes of the DEGES2W SID.
Actually the routing should be "DEGES..MINGA.Z1.SUDEN"

• It looks like the aircraft is just go flying the SID normally. "DEGES2W DEGES"
• Then it turns westbound again, inbound "_RWY28KLO03DME" to fly the SID a second time (as mentioned above).
  
• After that there's a small part which contains the correct routing "DEGES..MINGA.Z1.SUDEN"
• Last part just contains a part of the original routing "DEGES.Z1.SUDEN"

---

I think it could have something to do with the fact that both fixes DEGES and MINGA are already in the original route of the aircraft because when I'm using a fix that isn't in the route already it works.
f.e.: "route ZUE..MINGA"