Q:

c-lightning missing outputs

A few days ago I did a submarine swap in order to rebalance a channel of mine.  I opted to be refunded on-chain using a brand-new address generated with c-lightning newaddr command.  I used the p2sh address (aka starting with 3...) because last time I had some issues with the bech32 version. 
Here is the point: the on-chain transaction has (at time of writing) more than 80 confirmations, but my c-lightning node still cannot show the output with the listfunds command.  
Using dev-rescan-outputs didn't get any results as well.  
Am I miss something?  Have that utxo gone lost? 

A:

For readers, this issue has been solved by @cdecker here: https://github.com/ElementsProject/lightning/issues/3359. 
TL;DR: Use the --rescan startup parameter of lightningd. 