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Are you using Developer Mode or made changes in it?
No
Brief description of the issue:
I planned an IFR flight from Hanover (EDDV) to Dusseldorf (EDDL) via VAXE1S and HALM1X:
In MSFS the interesting approach waypoints look like this:

Opening the .pln file with Notepad++ shows:

So MSFS does not write it’s own flight plan correctly into a .pln file. Instead of writing the waypoints
GAPNU
DISIP
DL525
DL555
NATOS
EDDL
it’s writing
GAPNU
RONAD
EDDL
Provide Screenshot(s)/video(s) of the issue encountered:
See above
Detailed steps to reproduce the issue encountered:
See above
PC specs and/or peripheral set up if relevant:
Not relevant
Build Version # when you first started experiencing this issue:
1.20.6.0
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Do you have the same issue if you follow the OP’s steps to reproduce it?
Provide extra information to complete the original description of the issue:
If relevant, provide additional screenshots/video:
I think that your flight plan is correct from EDDV to EDDL. It is confusing how your flight plan with the SID, STAR, and approach are “translated” into something that MSFS understands for all the various aircraft/FMSs.
This “translation” is the flight plan file (.pln). Is this “translation” correct? One issue are various limitations in the World Map flight planner. For example, EDDL ILS 05R has several entry waypoints. RONAD is one of them. BUT there is no way on the World Map planner for you to specify RONAD as the approach entry point. How does it get from the STAR to the approach? It “unwinds” the STAR and approach waypoints and fills in other waypoints to make the flight plan work.
It is very clumsy because of the structure of the flight plan file carried over from FSX. The flight plan file uses waypoints, navaids, and airports to map a flight. It doesn’t use directly SIDs, STARs, or approaches. In order to fly a SID, STAR, or approach, it identifies them to corresponding waypoints. Also, the flight planner used to draw big, circular approaches. This has been fixed in prior updates.
The flight planning system is going through changes due to the work being done by the Working Title team on the G1000 NXi. Until their work is fully implemented in MSFS, we’ll probably continue to see differences in the World Map flight planner.