Can't interact with redstone components while crouching

Couldn't confirm for MC 1.13-pre4.Cannot reproduce. What gamemode are you using? Could you explain a bit more what do you mean with "interact"?

Do you hold anything on your hand while trying? Maybe you are trying to place block on redstone component?

Holding something + sneaking prevemts interacting with all blocks, having an empty hand or not sneaking will not, this is by design so you can use the item in your hand.