This bug happened to me at the launch of the 11.0 prepatch a few months ago as well but instead of Timewalking Badges it was other currencies, such as Seafarer’s Doubloon (roughly 1100) and Honourbound Tokens (roughly 800).
I have made multiple tickets to Game Masters but they haven’t done anything other than writing that I should submit a bug report. I’m sceptical to if a bug report is going to restore all those tokens, think it’s an issue for Customer Support to fix, but I have my hopes that one day it’ll be fixed.