I don't use Flyspray for a code project. I also host it locally on my home workstation, where it is not exposed to the world. I'm the only user.
Last weekend I tried out MantisBT and Traq, but neither can match Flyspray on features.
I am aware of the whole situation. Arch has an issue on their Flyspray for moving away from it, citing uncertainty around Flyspray. I have my own fork of Flyspray, which I used to submit a couple PR's several years ago. There is a Flyspray fork on Github which has seen a significant amount of activity over the last year.
After spending many hours trying to make 1.0-rc10 work with PHP8.1 (quite a Pandora's box), I decided to try upgrading to the Flyspray ~HEAD. After a couple issues with the upgrade and migrating several minor changes to my custom theme, 1.0-rc11dev seems to work as it should.
I am a little tempted to recreate Flyspray as a Laravel application, though.