Broken layout for transcriptions on add sentences page

[Yorwba]

To Reproduce

1. Activate "Always show unreviewed transcriptions and alternative scripts" in your settings.
2. Go to "Contribute > Add sentences"
3. Add a sentence that will automatically have a transcription generated, e.g. フリガナを降れば降るほど見えにくい。
4. The sentence and transcription are displayed side-by-side, squashing the text:

Expected behavior The sentence and transcription should be in rows as on the standalone sentence page:

Additional information This was likely introduced in #3008 (which I deployed this weekend) specifically making the sentence flex.