A user on the English Wikipedia reports that when saving an edit to the lead of an article in Visual Editor, a table lower down the page was "modified and broken":
Note that it didn't alter the opening of the table.
About a week prior, an edit with VE to a page in my userspace that contains an unfinished and unclosed table similarly had all the table syntax deleted exlcuding the first line of the table. https://en.wikipedia.org/w/index.php?title=User:Thryduulf/Hierarchy_of_content_decisions&diff=564156742&oldid=564156599
This is obviously very broken in that it leads to significant content corruption, even running together words in the in the second example.
It doesn't happen every time, for example I wasn't able to reproduce it in my sandbox https://en.wikipedia.org/w/index.php?title=User:Thryduulf/sandbox&diff=565239631&oldid=565239447 and earlier tests showed that simply removing the closing |} is not sufficient to trigger this.
Possibly this is related to bug 50104 and/or 51172