Don't understand fees on a particular bitcoin block

[Bitcoin]

Don't understand fees on a particular bitcoin block

I am comparing and contrasting blocks 200000 and 164246 of the bitcoin blockchain (looking via the bitcoind api or https://www.blockchain.com/explorer?utm_campaign=expnav_explorer is fine).

Looking at the coinbase transaction in 200000, the output amount (of 50.635...) is clearly the sum of the mining fee (50) and the sum of the transaction fees.

Looking at 164246, the coinbase output amount is exactly 50. Yet there are clearly fees in the 100 transactions in the block. Where have the fees gone? Have they not been collected by the miner?

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