Please post in proper channels.
“Transaction decoding is not available for chainId 56” isn’t an error, precisely. Just a notification that transaction decoding isnt available on the BNB chain. (Formerly Binance Smart Chain) Shouldn’t affect the transactions.
If you want to share a transaction hash, I can take a look and try to figure out why it failed.
Each transaction that is submitted, has to be processed by miners. This is why the network charges fees, even for failed transactions. Here’s an article with more details: https://metamask.zendesk.com/hc/en-us/articles/360045439051-Why-did-I-pay-gas-fees-for-a-failed-transaction