Transmission was updated to 3.0 and in the package repo it says its updated, but when I try to update it through LuCI Transmission 2.94 is the only available option. Are there plans to back port it to 19.07?
do you have a specific feature that requires this package update?
I would say eventually it will get updated on master branch as stable releases target stability and 3.0 is a major version upgrade
If you need it faster you can prepare a MR on github and switch to snapshot releases.