Save file for reproduction: https://gist.github.com/BattleRush/9aee3d230e45f4c199c23bb9f910e6f2
Steps:
1. Load game
2. Go to VAB
3. Load Craft for example "Station Parts"
4. Hover over this part and ALT + select the part to copy it
5. Try to rotate the duplicated selection and try to put it on the station part next to the rocket. (Bug happens also without any rotation)
On each try the bug isnt consistent and sometimes the parts are just missing (usually the Truss segments)
KSP Version 0.1.1.0
Operating System and version Win10
CPU and GPU models, any other system information which could be relevant
OS: Windows 10 (10.0.19044) 64bit
CPU: AMD Ryzen 7 3700X 8-Core Processor (16)
RAM: 65481
GPU: NVIDIA GeForce RTX 3080 (10067MB)
SM: 50 (Direct3D 11.0 [level 11.1])
Fixes / Workarounds (if known..)
Unknown
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No Mods installed