The two branches diverged 2 years ago and the changes implemented in R21 have never been imported into R22.
Now c-tagging and Continuous2D tagging are available in R22, as well as Truth Tagging with GNN and the high-pT extrapolations in continuous WP.
differences with R21 branch (considered the one up to date, so the reference) are reported here: differences_R22dev_vs_R21.txt