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Whelp, I just found something they fix.
Mumei's Ult clears the first waves of Shieldbeats (sandwiching you from left and right) and Takodachis (sandwiching you from up and down).
If Mumei's Ult removes the XP gems, you only lose the XP on screen but the rest of them are still there so you can gather those XP easily.
Now Mumei's Ult only clear the mobs on screen not the entire waves.
The waves happen at 1:30 (shieldbeats) and 3:15 (takodachis).
I think it's still doable in version 0.4.1.1662717673 (fix for super items rate).