Starting with a TVR-400L quad adapter, flipping it 180 degrees, so the 4 smaller connectors are facing up.
Attaching 4 terrier engines on these connectors and placing a TVR-2160C stack quad coupler on these 4 engines as seen in the picture below:
https://postimg.cc/Z9PfJfCk
Afterwards changing the anchor point to the TVR-2160C and trying to disconnect the terrier engine from it.
This resulted in a crash. No known fixes.
(This was in an attempt to bypass the restrictions while inverting the quad adapter and only having 1 engine attached)
KSP version 0.1.0.0.20892, vanilla
Windows 10 21H2 19044.2604
i5-9600k, rtx2070s
3440x1440 resolution