with recent change to properties of blocks affecting entities that are only partially above them it wasn't applied to items. see clip: https://clips.twitch.tv/OriginalObesePeachAsianGlow-rPcWFc9qWFj7lhXw we'd expect the item to slide on the ice.
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The item seems to slide on the ice only - I don't see any other blocks underneath.
The bug report is valid
The way I see it, the item is more on non-slippery ground than slippery, so taking more frictiom makes sense.
If the concrete is replaced by air, does it still happen?
According to slicedlime's changes video (not official source, I know) the fix for MC-1133 was that the properties of the first-collided-with block are used, and since both the concrete andice are collided with at the same time, I'd recon the most-collided-with block is supposed to take priority.