Validation tooltip inside input-group displays incorrectly in IE11

[sktw]

In IE11 a validation tooltip inside an input group displays to the right of the input. See the screenshot below from the bootstrap docs, specifically the tooltip for the Username field.

Setting left: 0px on .{valid|invalid}-tooltip seems to fix this.

[ffoodd]

Not sure about what's happening here (seems somehow related to flexbox), but I confirm that left: 0 fixes it, without any side-effect AFAIK.

[XhmikosR]

Fixed by #30960