We all run into this from time to time. Beer tastes good at bottlng, tastes phenolic after 2 weeks in the bottle. I’ve had this ongoing most of last year. Phenolic bottles after a couple weeks, but anything I keg is fine even after months. I haven’t figured it out, but it has to be something in the bottling line. If keg beers are fine then it can’t be siphon cane/tubing either, I’m using the same one.
I’ve cleaned everything with pbw, taken bottle bucket and bottle faucet apart, scrubbed, soaked everything in pbw, then star san, replaced hoses. Been through 3 bottling wands. Boiled sugar, stirred in with sanitized spoon. Sanitized bottle bucket with star san. I’ve soaked bottles in bleach, followed by pbw overnight, scrubbed with bottle brush. visually inspected clean, throw away ones that won’t. I’ve tried star san on some bottles, iodophor on others in an avinator right before filling. I sanitize caps in star san. Same results - kegs good, bottles suck. I’ve even tried priming with dme instead of corn sugar to see if that made a difference. I’m still trying to figure it out.