This actually worked. Thanks  I think I used p2wpkh-p2sh prefix previously. Still is very confusing for me but at least now I have confirmed that private key generated in offline and unsynced bitcoin core wallet can be imported to electrum

I used command
dumpprivkey bc1(recieve address I just generated)

I tried importing into electrum with prefix but no luck either. Just like I explained in point 6 when you paste that private key into bitaddress.org (offline version from github) you get many addresses but none even looks like recieve address generated in bitcoin core (bc1.....)
Same situation happens when you generate address with native segwit Bech32 unchecked.

Just did that on fresh linux virtual machine.


And nothing else happened.

I try to make this short, has anyone enounterd a problem where private key from bitcoin core gives different address with 0 balance when imported info electrum?

Steps to reproduce.
1. Install bitcoin core 0.21.0 on windows or linux
2. Cant sync because machine is offline
3. Create wallet and generate native segwit address to recieve coins (it starts with bc1***)
You can send some coins on that address and it can be searched on blockchain explorer
4. Open console and dump priv key for that address
5. When you try to import that key into Electrum the balance shows 0
6. When you enter that private key into bitadress.org it shows completely different public address and does not show the one you generated in bitcoin core (bc1***)

My question is, is it really a bug in 0.21.0 version, or maybe its not possible to move wallets like that?