note there is no standard for signing messages with bc1 addresses so if you use electrum to generate the signature the challenger also has to use electrum to verify it.
If I remove or change any symbol in the message it gets signed correctly with no problem. But the original message still has an issue.
Can you tell us what version of the electrum you currently use?
This is an old issue of old electrum version lower than 3.3.4 if you can use the latest version of Electrum I tried the message you are trying to sign and verify.
It's all fine to me so maybe you are using old version of Electrum that is why you are having an issue with verifying a signed message.