It looks as if the 10k-tools flagged post list is b0rken.
Next to the
review link in the toolbar there is a flag counter showing there are 10 flags to be reviewed:
Clicking on that flag counter leads to an empty page:
The moment I visit that page (through clicking on the flags counter, or by going to the review queue first then clicking on
Tools, selecting the
flags tab if not already selected), the flags counter disappears from the toolbar:
but after a while (half an hour, an hour?) the flag count re-appears in the toolbar.
Either the counter is wrong (presumably taken from a Redis cache somewhere) or the 10k flag review page is falling over every time someone tries to load it.
This at first appeared to happen only on Meta, on Stack Overflow the flags page has plenty to review. However, there are now reports of other mishaps with the same page on Stack Overflow.