Record with Voice block: primary button is abruptly cut off on the right.

### Impacted plugin

Jetpack

### Quick summary

The right hand side of the Record with Voice block is cut off abruptly.

### Steps to reproduce

1. enable beta blocks.
2. launch the editor.
3. insert the Record with Voice block.

### A clear and concise description of what you expected to happen.

The right hand side of the primary (highlighted) button has the same mirrored shape as the left hand side.


### What actually happened

The right hand side of the primary button is abruptly cut off.

### Impact

All

### Available workarounds?

There is no user impact

### Platform (Simple and/or Atomic)

Atomic

### Logs or notes

Tested with Firefox 119.

Enable beta blocks, launch the editor, and insert the Record with Voice block to reproduce the cut-off primary button in Firefox. Compare the two sides of the highlighted button; done means the right side has the same mirrored shape as the left side.

Written by the indexing model from the issue text.