Steps to reproduce:
- Insert a table
- Go to Table Properties dialog
- Enable "Collapsible"
- Save your edit
- Re-open VE
- Open the table properties dialog again
- Enable "Collapsed initially"
There is a text [Expand] in the caption field and a cell operations arrow beyond the page margin.
I am not seeing this behavior in en.wiki but in test2 and beta, therefore flagging it as recent regression.