I put the radio button payment option on the site a couple of weeks ago in V10-0-2 and yes the bounce page comes back, so pulled the change and reverted. No news if they are going to fix this.
This is the post that 'brucet' confirmed the problem, but do not know why it doesn't happen on your version unless it is fixed in V10.0.3. There was also a bounce page introduced when having just one PSP (not radio buttons) but this was planned for a fix in v10.0.3.
The v10 checkout normally bypasses the old PSP bounce page - it is no longer required. However, changing the payment method selection to radio buttons forces the appearance of the bounce page.
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