Balsamiq Edit: This has been implemented in version 3.3.14
Create a text element
write some text
use “tab” to align a certain text to the next tabstop
the last “tab” is not saved (it is simply missing)
you can go back into the text and put the tab in as often as you want, as soon as you enter the text area it’s gone again.
typing a tab and some letter saves the tab correctly, then going back in and deleting that additional letter works
I do remember seeing this behaviour a while ago already