Zero issues with standard regen in icy or snow conditions on my D. Michelin X ICE3 tires for the season.
Negative samples are not interesting. Obviously if it was happening all the time that would be a more serious problem. This problem has been reported multiple times on this forum. It's a matter of time basically.
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My 85D has been perfect in ice and snow. No slip or slide ever. Always keep regen on.
The D is much better.
ditto.