Bug with Vault Window

Currently, whenever I open my Great Vault window, I get a Bug warning from the BugSack/BugGrabber Addon. I have disabled all other addons, and I get this error whenever I mouse over the Raid Path in the vault. It seems that there may be a missing line of code or something.

The error information is as follows:

"15x ...ns/Blizzard_WeeklyRewards/Blizzard_WeeklyRewards.lua:678: bad argument #3 to 'format' (string expected, got nil)
[string "=[C]"]: in function `format' 

[string "@Blizzard_WeeklyRewards/Blizzard_WeeklyRewards.lua"]:678: in function `HandlePreviewRaidRewardTooltip'

[string "@Blizzard_WeeklyRewards/Blizzard_WeeklyRewards.lua"]:613: in function `ShowPreviewItemTooltip'
[string "@Blizzard_WeeklyRewards/Blizzard_WeeklyRewards.lua"]:538: in function <...ns/Blizzard_WeeklyRewards/Blizzard_WeeklyRewards.lua:536>

Locals:
(*temporary) = "- %s (%s)"
(*temporary) = "Queen Ansurek"
(*temporary) = nil
(*temporary) = "string expected, got nil" 
"

The error repeats every time you try to mouse over which bosses you have killed and what not.

Secondly another issue with the Great Vault, if this is a bug or intended but you cannot mouse over the Delve Path to see how many more delves you need to increase the reward for the path, the way you can mouse over the dungeons path and see how many dungeons for your like top X number of runs.

It just says to complete a higher tier delve to increase the reward but doesn’t say how many you have to clear to increase it.

Just putting this out there in hopes that its already a known issue and I just missed the post about it, or its not known and it gets fixed eventually.

Some have had success fixing this with a cvar reset
/console cvar_default

ymmv, no refunds

Unfortunately, that did not work for me, so the issue is still happening. So, it is something other than that.