Spells overriding hotbars

Confirming. Affected classes:
all main and hybrid healers (warden, friar, ...)
Melee-Caster hybrids (Thane, Champion, Minstrel, ...)
Pure spellcasters are not affected.

Mechanic: no spell downgrading; e.g. heal baseline spells are updated automatically on level up -- but same applies to any spec line spells without downgrading mechanic

Root cause
Whenever the spell list (available spells) is updated - on level, when training or respeccing - the client does a force-refresh of the hotbars.
The hotbars items are assigned by a placement number of that spell in the given spell line. On level up or training the placements of the spells might change (=getting a new or an updated spell).
Instead of getting the "updated spell" the client just keeps the original placements on the bar and therefore result in mashed up qbars.

Example - a healer, level 15
His healing spell line has the following spells in that order
[1] Ressurection
[2] Minor Specline Heal
[3] Mayor Baseline Heal
[4] Minor Baseline Heal

The qbar is sorted by: [4]-[3]-empty-[2]

Now the healer is getting to level 16. On level 16 the mayor baseline heal is updated to the next rank.
His healing spell line will look like this:

[1] Ressurection
[2] Minor Specline Heal
[3] Minor Baseline Heal
[4] Mayor Baseline Heal

The minor and mayor baseline heal swapped places.
The same will happen on the qbar because it is using the ranks of the spell line [1], [2] etc.