Impossible to seek back on tvOS with Free remote

VLC 3.3.7 (432) on an Apple TV 4K

Using a Free remote, navigation is very very difficult if one attempts to seek forwards, and it's impossible to seek backwards.

There was a special Apple TV bundle available for Free ISP customers with an Apple TV 4K, but as a cost-cutting measure, the Siri remote was replaced by a cheaper Bluetooth and IR Free-branded remote. I got one of those bundles.

Original Apple TV remotes of different generations and the Free one on the left:

When using the Free remote:

• the right handside of the ring d-pad and the ⏩ button will forward slightly faster, and pressing more times will accelerate the fast-forward speed. The only way to play at normal speed is to use the play/pause button to pause playback, and make it play again
• the left handside of the ring d-pad and the ⏪ button don't seem to do anything (they don't cancel fast-forward, they don't seek back)

As a work-around, I tried using the Apple TV remote on an iPhone, but the -10/+10 seconds buttons don't appear. There doesn't seem to be a way to seek using the touch area.

Image from https://support.apple.com/en-gb/guide/tv/atvb701cadc1/tvos:

I would be happy to buy a second-hand remote for the developer that needs one to test this functionality. They're quite easily available on "Le Bon Coin" in the 20€-40€ range.