Resting do not give xp bonus.

[wlasser]

Waiting in resting area(inn's, capitals) give a visual ("ZZZ"), but something wrong with UpdateFields and this is not showing on XP bar.

[xcvatr]

I can confirm that resting "works" i.e. it does give xp bonus.
It is only the interface that does not show the experience bar as blue when rested.
I monitored rest_bonus in the characters table while killing mobs at the same level. The moment rest_bonus hit zero, the xp gained from the kill was halved.