When you have a Grid set to Auto mode that has multiple rows of items, and you try to drag an item to the end or beginning of a row, you'll see that the blue vertical indicator doesn't appear.

This one's much easier to explain with a video:

I'd expect the blue vertical indicator to appear at 0:09 and 0:17, but it doesn't.

It does appear when you attempt to drag to the end of the block. It's only the ends and beginnings of rows in the "middle" that have this problem.

Actually letting go and dropping the block works fine. The issue is just with the indicator.

This seems to be a problem across all our container blocks e.g. I can see it happening in the Row block as well.