Google Product Forums
Re: Unable to delete any location from Location History
Google Mobile Help Forum
Android Devices : Maps, Earth, Latitude :
Well, maybe if more will post here, the thread may attract attention of right people.
And yes, this is very annoying to see some obviously wrong locations and be unable to kick them.
I have encountered the first undeletable points back in the last days (28) of April, but noticed the "Show all points" only few days later.
Do you guys remember when did this start for you?