Arcane surge inconsistant when linked to Wither after 3.0.1e

Before patch, I could use wither on the ground or an enemy for about a second and get arcane surge buff.

After patch, I use wither for several seconds, I don't get the arcane surge buff until I use any skill. The skill doesn't have to be linked to arcane surge to get buff after using enough mana with the skill attached to wither.

Example: use wither for 3 seconds, shield charge and receive buff
use wither for 3 seconds, summon a golem and receive the buff
use wither for 20 seconds, don't get arcane surge buff

I've tested wither with other skills, and it's performing correctly. However, wither linked to arcane surge is not working.

Another part of the issue is arcane surge is being stored until your next used skill, including wither. An example of this would be to use wither for a few seconds, go afk for 5 minutes, come back and cast wither or any other skill and it'll work.

Thanks,
- Murf -

Bump.
Same thing with any channelling spell.

same issue with blight. The behavior is not consistent. Some time you get buff on casting blight. Some time you need to cast another skill to get the buff. Definitely a bug.

I'm wondering if this is going to be fixed soon because it's really uncomfortable to use arcane surge support when it was so smooth before the patch.