NAV problem with a small jink in the simbrief produced flightplan

[salokin]

MSFS2020 A359

Simbrief gave me the following routing from EDDM to RJTT

KIRDI DCT MEDEL DCT STEIN DCT TEGRI DCT DINRO DCT UDROS UM859 KARDE UN644 ROLIN N644 TETRO DCT BARAD M747 SUBUT T923 ERLEV M11 RODAR A909 TUNEK B143 KRS A480 OTBOR N147 GENGA N143 RUDIZ N161 SARIN A368 FKG W188 GOVSA W66 DKO W69 HUR B339 LADIX W34 VAPGU W100 ORAVA W201 UNSEK A326 DONVO G597 AGAVO Y644 EGOBA Y697 LANAT Y71 XAC

There's that little jink between ORAVA and UNSEK over China that the plane wasn't able to follow. It remained in NAV mode but the curved path it set itself meant it ended up going north at ALARA and then circled until I took over and gave it a direct to a subsequent waypoint.