Ok it’s getting stranger. I just copied the folder and tried it directly in my home directory and here it works. It seems somehow that the drive backup is interfering, but this is the first time this happened to me… other programs are able to rename files in large folders and obsidian is able to create untitled 1, 2,3… immediately and also to write into those files… Probably a rare occurrence… Still strange, isn’t it?! Anyway, probably not the most urgent bug (if it’s your bug at all)
PS: I just realized something that might be of interest: there is a short delay in the home folder too but less then a second