sobi3ch So first off we have the Jenkins Queue.
The queue does not know about multibranch as belonging to a single "project" so instead it sees them all as different jobs. The queue is designed to care about the order within a job but not the order between jobs.
Each tag gets its own job, thus the tag v1 could be built after the tag v5 even if v1 was put in the queue before v5... there is nothing to do with multibranch, you can get the same effect with regular freestyle jobs
Next, the tag discovery is not in a deterministic order from git.
Simple tags do not even have a creation timestamp in the git data model
Annotated tags do have a creation timestamp, but that does not reflect the push time
So we have no way to reconstruct the order of simple tags, and we only have a way to reconstruct the creation order of annotated tags... that is not the actual release (i.e. push to canonical repo) order
Ok, so you might say "well sort the tags"... hmmm except sorting version numbers is a hard problem... does where does RC go w.r.t. alpha, beta, milestone, etc. There are some widely held conventions... but nothing that is a hard and fast rule.
Finally, if you really want them built on discovery, it's an extension point you can write a plugin that does exactly that and install it... then just configure that option in the build strategies... I just choose not to enable users to easily shoot themselves in the foot... I do not prevent the foot shootings