I believe the issue you’re seeing was fixed in CL 2124557 if you are able to integrate that into your build?
Version 4.3 preview.
Reproduction:
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Take ribbon particle from Content Sample (the one which looks like spark with smoke behind them).
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Place them on level.
No ribbons! I mean there are ribbons, they just don’t fallow particle ;).
Hey thanks. I pulled newest sources from GitHub and it works now (;.