No extrusion after first toolchange (IDEX 500)

Hello,
I have weird extrusion problems on my V-Core 4 IDEX.

When printing in single mode, everything is fine. It doesn't matter which tool head I'm using in single mode.

If I try to print any dual colour models, both extruders stop extruding during printing moves after the first toolchange (as seen in the picture). I could correct the other issue with the shift.

Otherwise the extrusions still work, I could see that during the toolchange movements.

I tried slicing with PrusaSlicer and OrcaSlicer, the results are the same. Both slicers were configured according to the documentation.

I have not tried mirror and copy mode.
20241128_001643.jpg
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