I messed around on Sparkpool and mined a single, 1 BEAM.    Sent payment to my wallet. It never shows up.     Here's the issue with the BEAM wallet i have found.  

1) If you mine to an address that expires, will never arrive
2) If you delete a created payment address, payment will not come to the deleted address even though it was initially created in your same wallet.
3) If you have to restore from seed while mining, you can no longer receive the mining rewards in your mining account because you cannot re-create the same addresses you were mining to after you restore the wallet with the seed.

In my instance, I had created about 10 non expiring addresses to mine on several pools, ended up deleting several of them that I didnt end up using, and copied a deleted address to my batch file I was using to mine with by mistake (instead of one of the active ones).    Again, it was just 1 BEAM, but it clearly shows that if you delete the address, you can't get them back.   On sharkpool, I have a balance in an address that is no longer on my wallet, so it will never show up.

I have since fixed by using an unexpiring listed address, but a word for everyone to make sure you are mining to an active address on your wallet, and don't restore from seed or you won't get your coins either.     I'm not sure if this is meant to be this way or what.   This has to have happened to others I would think.