Why does decoded block data not match coinbase transaction input?
Segwit changed the transaction format. This new format is specified in BIP 144. This new format is actually a modification to the original transaction format. The changes are just additions to it.
Specifically, what you are missing is that the field immediately following the version number is a single 0 byte (referred to as the marker byte), instead of the input count. This was done specifically to make a transaction appear as if it has no inputs to a legacy transaction parser. Following this marker byte is a flag byte, which currently is a single 1 byte. Then you have the input count, inputs, output count, and outputs as was previously. The last change is that following the outputs, instead of the lock time, there are multiple arrays containing the witness data for inputs. Lastly the locktime ends the transaction as previously.