Form input with input-group-prepend and valid-feedback/invalid-feedback lose border radius

Github Issue: https://github.com/twbs/bootstrap/issues/29459
Bootstrap version: 4.3.1

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Bug:

You can see the right corner is not rounded.

The reason for this issue is because .invalid-feedback as last child inside .input-group. (Answered by midzer)
The last div in the input group will be rounded but if either .valid-feedback or .invalid-feedback is the last div of input group, the right corner will not rounded.

Current Solution:

Add a .rounded-right in input. So you can see now the right corner in rounded.