I was in the same mindset until I had it work one time for me on the bench. This is the exact pickup set that I bought : https://www.amazon.com/Mxfans-Double-Ceramic-Magnet-Electric/dp/B07YBZDF9R/ref=mp_s_a_1_3?crid=3OGN8XRVNODNY&keywords=active+pickups&qid=1645981785&sprefix=active+pickups%2Caps%2C412&sr=8-3

I have seen a video online showing these are indeed wax potted after someone cracked the case open. It just seems odd to me that all 4 would have the exact same symptoms.