I've noticed this a couple of time in my blocks. Most recently it was when I was playing with the Additional CSS class(es) field for the sb-children-block. Previously it was for other blocks - from oik/oik-blocks.
Steps to reproduce
Enter something into the Additional CSS class(es) field. e.g. fred
Navigate away from the block and back again
Select the current value of the Additional CSS class(es) text field
Press the delete key
Sometime the block is deleted.
It's not easy to reproduce at will.
Chances are that the entry field is losing focus and the selection goes back to the block in the editor area.
I've noticed this a couple of time in my blocks. Most recently it was when I was playing with the Additional CSS class(es) field for the sb-children-block. Previously it was for other blocks - from oik/oik-blocks.
Steps to reproduce
It's not easy to reproduce at will. Chances are that the entry field is losing focus and the selection goes back to the block in the editor area.