I’d say it is normal. I always have had to pump up my tires before every ride for all my tubeless bikes. How much depends on a lot of things, like how porous the sidewalls are, how fresh the sealant, etc. 4 psi overnight doesn’t seem like a big deal. My guess is it doesn’t leak 4 psi every night because the pressure kind of equalizes a bit and the leakage will slow way down.
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