Just yesterday I was leveling through Legion in Chromie Time on that same character and I got to level 49 there. When pre-patch dropped I checked the map and Legion zones were still 10-50 which I thought was weird since they said Chromie Time will extend to 60.
I go to Chromie to disable and re-enable Timewalking Campaign only for Darion to start spamming me with Shadowlands intro quest and option to choose a campaign is now gone. What’s weird is that same stuff is NOT happening with my level 40 alt who can choose freely.