This post was composed after first learning of this incident from:

I tried to warn you, months ago...
#10820

Sure. It's no fun to suddenly have >10M missing from your wallet.

https://twitter.com/zerofeerouting/status/1491105199796400129

Here's the Tweet that starts this thread:

Fellow LND node operators:

Do not use unconfirmed funds to open new channels for now.

Due to a bug in LNDs coin selection process you might end up funding that channel with already spend coins, borking your balances.

Please retweet for visibility.

https://github.com/lightningnetwork/lnd/issues/6241

And the issue in the Github repo for lnd:

lightningnetwork/lnd - Lost anchor: stuck sweep transaction (unconfirmed balance) #6241
https://github.com/lightningnetwork/lnd/issues/6241