Flight Root Part Below an EnginePlate and Decoupler Causes Major Issues for a Craft

[Anth]

KSP2 Version: 0.1.0.0.20892
KSP2 Version: 0.1.1.0.21572
KSP2 Version: 0.1.2.0.22258
Operating System: Windows 10
CPU+GPU+RAM: i9 9900K+3070ti+32GB
Mods Used: None

2 Videos for this Bug Report:

• First video shows it happening in space
• Second video shows COM appears to be calculating between the two separated crafts soon after launch.

 

First Video:

Spoiler

https://youtu.be/-wr0cShyia4 (19 Seconds)

Things of note:

• Loss of control
• Camera isn't focused on either craft
• After separation the throttle still affects both crafts
• Both crafts phase through each other
• Similar result for 0.1.0.0 + 0.1.1.0 + 0.1.2.0

How to Replicate:

1. Load supplied 0100RootPartSecondTank
2. Load 0100RootPartSecondTank again (Counters another bug) 
3. Give a small amount of thrust to match the video
4. Stage
5. Play around with the throttle

Save file from First Video:
https://www.dropbox.com/s/y1tk7wb0qaxq6b9/0100RootPartSecondTank.zip?dl=0

Log Files From First Video:
https://www.dropbox.com/s/3ddvvoqzcnbbxjz/Ksp2%20%2B%20Player%20Logs.zip?dl=0

Second Video:

Spoiler

https://youtu.be/qxzK3KCqJtw (17 Seconds)

One thing of Note:
It appears that in this case the Camera is focusing on the Center of Mass of both crafts 

Craft File with Root Part on 2nd Tank From Second Video:
https://www.dropbox.com/s/pt06u8yyxyu7qv2/RootPart2ndTank.zip?dl=0

 

Work Around:

• Jettison the Engine Plate's fairing/shroud However SAS is not engaged anymore.
• Change root part to the top of the craft.

Edited June 1, 2023 by Anth12

[Anth]

In addition:

Separating the decoupler from the engine stages does make things act differently.

Edited April 28, 2023 by Anth12

[Dakota]

This has been fixed as of v0.1.3.