Flight Craft momentarily moves away from its trajectory at high speed, before snapping back

[Shiny55]

Reported Version: v0.2.0 (latest) | Mods: none | Can replicate without mods? Yes 
OS: Windows 11 | CPU:  Intel Core i7-9700 | GPU: NVIDIA GeForce RTX 2060 | RAM: 15.81

 

Craft suddenly disappears from view and then reappears on a much higher energy trajectory, usually out of the system.

I've found this a few times on launching from Kerbin with a variety of different craft.  Not sure if there is a pattern, but it occurs in the upper atmosphere, sometimes when fast forward has previously been used. Once set-in it reoccurs (even restarting the game doesnt help) and is now present in every launch.

Edited January 7, 2024 by The Space Peacock
added computer specs

[Anonymous Bug Reporter]

Reported Version: v0.2.1 (latest) | Mods: none | Can replicate without mods? Yes 
OS: Windows 11 | CPU: 13th Gen Intel(R) Core(TM) i9-13900K 3.00 GHz | GPU: Gigabyte RTX4090 | RAM: 64,0 Go

Taking off from Kerbin, the rocket arrives at 70km, and suddenly accelerates dramatically, then, a few tens of seconds later, returns to the position it should have, but the instruments give bad indications (apoastre)

Included Attachments:

Desktop2024_02_17-19_17.36_02.mp4

[Seapiglet]

Severity: Medium
Frequency: Always (but only in this game - my son's saves are unaffected)

Issue:  Any vessel that gets to 70,000m above Kerbin will appear to rapidly shoot off camera so the screen shows no vessel.  If you then switch to the map view, for the first second or two everything will look normal, but then the vessel icon will teleport to a different location and lose its trajectory line.  It will move quickly out towards the Kerbin SOI edge (if you go back to the vessel view you get an exciting view of Kerbin receding fast!).  As soon as the vessel icon gets to the SOI edge on the map everything will instantly flip back to normal, with the vessel back on its original course (but maybe 15-20 seconds later).

This only started happening recently, but now seems to happen with any vessel (including vessels designed before it started occuring).

 

Steps to Reproduce:

Load the save file and fly any craft to 70,000m.

 
Images:

Video Evidence:

Additional Information:
Game was modded with 3 QOL mods when this began (InputBinder, MicroEngineer and Manoeuvre Node Controller), but persists after uninstalling them.  Problem only started well after they were installed so I suspect they have nothing to do with it, but could be wrong!

I will try deleting a bunch of old saves as someone suggested above and see if it clears it up.