Bug in Aave v2 Polygon causes some assets to become stuck in contracts

The bug only affects the Polygon implementation; v3 is unaffected.
Source: Bug in Aave v2 Polygon causes some assets to become stuck in contracts (https://cointelegraph.com/news/bug-in-aave-v2-polygon-causes-some-assets-to-become-stuck-in-contracts)
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