Bech32 conversion to legacy P2PKH? Electrum now generates Bech32 addresses for SegWit wallets.

Example: bc1qnntcclssmtuvfw2te7q49lzvw67cfvpzxger4j

Pubkey: 023f1b3421c6ae0c1758834d40806c2418194b507be261fa343a0636653f3ec75b

If I search for that Bech32 address on btc.com, I get redirected to:
https://btc.com/1FJJdX5g1DX7FRxJBhJNTDrRjTeihhsJLs

This pubkey-to-address tool also generates the same address from the above pubkey. 


Is it safe to receive funds at this 1FJJd... address?
Is there a downside to using this rather than Bech32?
Is it safe to receive funds at this 1FJJd... address?


Kind of. Your wallet knows the private key that corresponds to that address as it is the same private key for the bech32 address. However it does not necessarily know that it should be looking for coins sent to this address, so any transactions that send coins to that address may not appear in your wallet and thus it will be harder for you to spend those coins.


  Is there a downside to using this rather than Bech32?


As I said earlier, your wallet may not know about that address and thus won't track it. Even if it does, it is better to use the Bech32 address as that means that you will be using Segwit. The transaction fees for a spend from a segwit address will be lower than a similar spend from the non-segwit version of that address.