Sorry to barge in but "redeemed" means that the fund is now spendable not a re-opened channel.
When you force-close a channel, it will create an "our_ctx_to_local" transaction that spends the closing transaction,
it can't be broadcast until a number of blocks (shown in the transaction history) has passed and will automatically broadcast if Electrum is open.

Update to this: I've experienced this just now when I tried to open a channel with another instance of Electrum while another is opening a channel.
The error message is "Assertion error" then a "Disconnected" channel was created with reflected Lightning balance but the on-chain balance wasn't deducted.
There's no "Open channel" transaction either.

When I tried to Close the channel, it just returned with an error (as expected) and the status changed to "shutdown".
When I tried to force-close the "Shutdown" channel, it returns with the same error as yours.
So your LN funds must be a bug to begin with if there's no "Open channel" in your history,
I tried to reproduce it trice and the "bugged LN funds" reached 0.06 tBTC while my original onchain funds is only 0.02 tBTC and it wasn't spent.