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Tags: Update: We have confirmation on this now, Digging up a find while practicing Archaeology will now continue to grant skill points past 50. (Source)
Looks like Archaeology has been hotfixed to now always give one skill-up per dig, making it much easier to level. This was NOT listed in any hotfix note, so we’re unsure whether this is intended or not.
Source: MMO-Champion
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Will say this was happening on the > 500 side as well in Pandaria today. In the past, you used to only get skill-ups for < 100, so this is a huge shift in how you level archaeology.