Hi Dirk,
this chapter still applies:
LNM cannot use the many replacement options for Navdata in MSFS yet and this is unlikely to be fixed soon, if at all.
Some information is always lost when channeling Navdata through MSFS BGL into LNM. Always update the LNM data too and ignore the navdata update in the sim. This is for the sim and not for LNM. There is a reason why LNM gets its own navdata update from Navigraph.
Update the LNM database with the FMS Data Manager, select Use Navigraph for Navaids and Procedures and the issues should be gone.
Let me know if this helps.
Alex