Bridges are risky and there are many big hacks in cryptocurrency through bridges.

Blockchain Bridges Hacks
A Timeline and History of Recent Cross-Chain Bridge Attacks | Analog Insights

Bridging your Bitcoin to another blockchain, you no longer have Bitcoin but have Wrapped tokens. These wrapped tokens are not bitcoin and you might not be able to bridge it back to Bitcoin and get your initial value. It depends on liquidity pool and that bridge, peg of the wrapped token.

Like you bridge 1 BTC to 1 Wrapped bitcoin on Avax, what if later you bridge it back and get like only 0.1 BTC?