Why my cellphone sounds bad when connected to my car?

Last month I changed my iPhone 5s for a Huawei p20 lite and while everything looks smooth so far, my car audio is having problems.
When I connect my new phone via Bluetooth I can notice easily that sound is horrible, like if my speakers were blown, no matter if I use YouTube music, Spotify or even Apple music at best settings, it simply sounds bad.
I discovered that if I connect it using a 3.5 jack it sounds very good, I can notice the difference, at least as good as my previous 5s.

Do any of you have had this kind of problem?

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