I have 10 beacons within my base and each light stream is surrounded by a pillar. Within the pillars are stained glass blocks of various colors that change the beacon light as it moves up the pillar. 9 of the beacons are correctly lit, but one is unaffected by all of the stained glass blocks. I believe this happened when updating to 20w17a, but the problem may have already been there and I just missed it. I attempted to fix this by breaking the beacon and then replacing it, but this did not work. The only thing that seemed to fix this was breaking all of the stained glass and replacing all of it.
To explain the picture provided, The beacon in front of me is the beacon in question. It was the default color before I broke and replaced the black stained glass block at its base. All other stained glass blocks in its pillar are not working such as the white stained glass in the bottom of the picture.