R-27T: Fails to track even after LA is given and well within max range

[Pavlin_33]

As the title says,
R-27T just goes straight, after launch, even though it's within parameters and the target is not maneuvering nor flaring.

In the attachment provided are both the track file (tried to reproduce it as close as possible to TacView) and the TacView file - look for Pavlin|33 callsign.

27T-goes-dumb.trk r-27t-dud.zip.acmi

[Ironhand]

Judging from the image, I’d say it was due to this: