Dragging and dropping portlets into different columns: Ordering glitch

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: 7.1.0 Beta 2, 7.1.10 DXP FP5, 7.1.X, Master
• Fix Version/s: None
• Component/s: Frontend Infrastructure
• Labels:
  • 7.1-could
• Fix Priority: 1

Carried over from https://dev.liferay.com/en/web/liferay-7.1-community-beta-program/feedback/-/message_boards/message/1712724, but now for Beta 2 (note: Beta 2 still listed as unreleased in JIRA affected versions)

• Empty page, 2-column-30-70 or similar.
• Add portlets/widgets: Left column: Navigation, right column: Documents and Media
• Drag Documents and Media below Navigation, to column-1

Expected behavior:

• Documents and Media appears below Navigation

Actual behavior

• Documents and Media appears above Navigation
• reloading the page doesn't help.

At least: After it's been ordered wrongly into position 1, it can be dragged down, below Navigation when staying within the same column.

Additional information:
I've started to reproduce the same behavior when I had three Navigation portlets stacked in column-1, but only when dropping "Documents and Media" between the first and second. After a few tries, I weirdly can't reproduce this any more. When I remove two of the three Navigation portlets, I can repeat the steps outlined above.