EDIT: I can confirm, this is a bug.
I can’t duplicate this. It sounds silly but did you press “OK” button after you adding it?
By the way the library shown in th picture is from here Additional Symbols - #9 by mgyger
EDIT: I can confirm, this is a bug.
I can’t duplicate this. It sounds silly but did you press “OK” button after you adding it?
By the way the library shown in th picture is from here Additional Symbols - #9 by mgyger