Handling coin bridges

Floki is the example here as well but this applies to other coins that use the Moontography bridge to send coins across ETH to BSC and BSC to ETH. The wallet address and amount of coins stays the same and the holder simply pays applicable ETH or BSC gas fees.

How should this be treated for tax? Is it just a non-taxed transfer since both wallets are in my possession or is it a sell (applied to “gain/loss”) followed by a buy (with no implication until it is sold/traded)?