Please be advised that there is a known issue with Flatpaks and Ubuntu 25.10 based releases.
This is part of Bug 2122161 which is being worked on to resolve this issue.
There is a more human friendly overview of this on OMGUbuntu
A fix should be arriving soon.
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tkn
3
Extra Info:
according to HughPH on github, the issue is caused by the new version of fuse:
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