Polygon changed their native currency to POL
All occurences of "MATIC" should be changed to "POL".
See https://polygon.technology/blog/matic-to-pol-migration-is-now-live-everything-you-need-to-know
From https://polygon.technology/blog/save-the-date-matic-pol-migration-coming-september-4th-everything-you-need-to-know :
Wallet Providers Update symbol: Wallet providers may consider changing the symbol of the native gas token from MATIC to POL on the Polygon PoS chain. Confirm embedded dApp readiness: Confirm that wallet-embedded dApps (bridges, staking providers, etc.) are prepared for the September 4th upgrade of the native bridge.
MATIC still needs to be changed to POL in the app. e.g. at:
https://github.com/AlphaWallet/alpha-wallet-android/blob/82c165b11abfdbc3ff80d3d14fe074a9de45b1a5/app/src/main/java/com/alphawallet/app/C.java#L87