[flatpak] - I cannot choose or change datadir when running from flatpak

[fanquake]

Previously (bitcoin/bitcoin#24612, see further discussion there).

flatpak run org.bitcoincore.bitcoin-qt -choosedatadir

The -choosedatadir Should allow me to choose the datadir. But it is not. It immediately starts downloading headers from the peers.
The chooses a predefined datadir in

~/.var/app/org.bitcoincore.bitcoin-qt$ ls
cache  config  data

• I am unable to modify the datadir location when I run the client using flatpak (on PopOS).

To reproduce

1. Install flatpak client
2. try the command

flatpak run org.bitcoincore.bitcoin-qt -choosedatadir

Everytime.

System information

1. PopOS, Flatpak version. Client information

$ flatpak run org.bitcoincore.bitcoin-qt -version
Bitcoin Core version v22.0.0
Copyright (C) 2009-2021 The Bitcoin Core developers

Please contribute if you find Bitcoin Core useful. Visit
<https://bitcoincore.org/> for further information about the software.
The source code is available from <https://github.com/bitcoin/bitcoin>.

This is experimental software.
Distributed under the MIT software license, see the accompanying file COPYING
or <https://opensource.org/licenses/MIT>