Some confusing changes to 21st Century Fox are occurring today:
https://finance.yahoo.com/news/fox-set-join-p-500-214600564.html

In summary,
1. FOX/FOXA symbols change to TFCF/TFCFA.
2. The Fox Corp. spinoff will take the symbols FOX/FOXA. (This company has been trading as FOXBV/FOXVA for at least the last 4 sessions.)

These changes have made for Wealth-Data. To get them, please restart Wealth-Lab and perform a Wealth-Data Provider update using the Data Manager.

It's not entirely clear to me if the symbol changes will occur for today's market session or after the close. In the case of the latter, we'll have some data corrections to perform before Wednesday's open.

It appears that these symbols changes are already in place for today's session.