I use a Chromebook to do my memrising and today, during a review session, I was able to edit someone else’s mem.
I believe I shouldn’t have been able to do this. The function disappeared again quite quickly, but reappeared again from time to time. I only tested it once.
The last time it happened, when I tried to edit something (say, a typing error), I then got one of those “woops” messages (if I recall correctly).
If you need any more information, please let me know.