There is an updated pull request by pfpulux against master on the void-packages repository https://github.com/pfpulux/void-packages python3-Flask-User https://github.com/void-linux/void-packages/pull/21279 python3-Flask-User: update to 1.0.2.2. A patch file from https://github.com/void-linux/void-packages/pull/21279.patch is attached