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Date & Time: 16.12.2021, 9:15 PM ST
Frequency: Always
World name: Omega
Monster name: Confirmed on Shinryu (Extreme), possibly others such as Phantom Train and Rathalos
Steps:
1. Enter the duty Minstrel's Ballad: Shinryu's Domain
2. Break any of his body parts (Left Wing, Right Wing, Tail, Worm's Heart)
3. The damage message displayed on the screen is incorrect - it still has the old pre 6.0 squish values, for example breaking the wing displays

The right wing is shattered!
Shinryu suffers 1622112 points of damage!

However, Shinryu's HP has been reduced to around 6.2 million since patch 6.0, these values are therefore no longer correct since in reality he takes only around 548000 damage.

This might occur in other similar situations such as the Doom Chimney in Sigmascape v5.0 and Rathalos's Tail in Great Hunt.