Do you here the same thing when listening to the US or the UK pronunciation of those? https://www.wordreference.com/definition/bad https://www.wordreference.co

Do you here the same thing when listening to the US or the UK pronunciation of those? https://www.wordreference.com/definition/bad https://www.wordreference.com/definition/bad https://www.wordreference.com/definition/bed https://www.wordreference.com/definition/bed (then yes, I guess it's coherent)