That is a known problem. Fixing it requires a new private key format because the private keys do not actually specify what kind of address you should create with them. It is important to note that private keys only create public keys, and a public key can be transformed into several different addresses now. The private key does not specify what kind of address to create from the public key.
Yes I know this, when we give the command RPC dumpwallet "destination", in the document just below the private keys, each segwit P2SH address has its redemscript but I do not know how to use it and I do not even know what the utility of that redemscript is. The Electrum wallet shows the new private format of the private keys of the segwit addresses, but no other wallet recognizes, only Electrum, if we import bitcoin-QT a bech32 private key generated in the Electrum of the error, because bitcoin-QT does not recognize the private key of bech32 address of Electrum