inputGroup no longer functions as expected with xf:numberbox

In XenForo 2.2, the following code:
HTML:

<div class="inputGroup">
    <xf:numberbox name="someName" min="0" step="any" class="input--numberNarrow" />
    <span class="inputGroup-text">someText</span>
</div>

Produces the following display:


The same code in XF 2.3:


This is because of the following CSS:
CSS:

.inputGroup
{
    [...]
    
    > .inputGroup,
    > .inputChoices
    {
        flex: 1;
    }

Removing flex: 1; fixes this issue.

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