Tooltip not disappearing after button has been removed

@vdweyer
Seems like the default value of the trigger option is 'hover focus' and not just hover that’s why you are experiencing this issue.
@patrick will check this, so we can improve it in the next update.

Meanwhile as a temporary fix, you can open the dmxAppConnect/dmxBootstrap4Tootltips/dmxBootstrap4Tootltips.js and change:

$(function () {
  $('body').tooltip({
    selector: '[tooltip-title]',
    title: function () {
      var expression = this.getAttribute('dmx-bs-tooltip') || '';
      return dmx.parse(expression) || this.getAttribute('tooltip-title') || '';
    }
  });
});

to

$(function () {
  $('body').tooltip({
    selector: '[tooltip-title]',
    trigger: 'hover',
    title: function () {
      var expression = this.getAttribute('dmx-bs-tooltip') || '';
      return dmx.parse(expression) || this.getAttribute('tooltip-title') || '';
    }
  });
});

this will set all your tooltips will be triggered only on hover and not also on focus.