An error occurred while saving the commentAnonymous commented
It's even worse than that: if you simply remove the Wiki tab from a channel, not only does it remove the tab (what is expected) but it also deletes permanently *all* the channel's wiki pages! Nothing in the Recycle Bin! Days of work gone! I had some hope to be able to restore the "Teams Wiki Data" library used in SP to store all the channels Wiki pages (one folder per channel) since you have the ability to restore the library at some point-in-time (but then losing the latest updates). But even that does not work since there's nothing in the Recycle Bin!
My advise: step away from the Wiki pages in Teams to avoid any unfortunate and unrecoverable deletion of content and use OneNote instead... until the product team fixes this major issue.
This feature is still in the backlog.