Thanks for the warning. That one would be difficult to discover. We've tested it and you're right, with a 6x4 grid and the widget at 3x3 each cell doesn't have enough space to show the bar/dots, but it thinks it still is big enough to show them.
It's a delicate balancing act getting these limits right, and we want to thank you for pointing this one out.
PS. i'm not a native English speaker, but your English doesn't sound poor at all to me.