One of the reasons some people like to buy Genuine Canon lens hoods is that they usually come with flocking on the interior of the hood to cut down on glare or reflections.
I have 18 different Genuine Canon Lens Hoods, and 9 of then do not have flocking on the interior.
There seems to be a trend that many of the newer Consumer grade Canon lens hoods do not come with the interior flocking.
Just out of curiosity I decided to make a list to show which do, and do not have, the flocking. Maybe you can add your hoods so we can all see which ones do not come with the flocking.
Canon Hoods that DO come with flocking:
EW-63 II (28-105mm USM)
EW-65 (28mm 2.8, 35mm 2.0)
ES-65 (50mm 1.8 I)
ET-65 III (85mm 1.8, 70-210mm USM)
ET-67 (100mm 2.8 Macro USM)
EW-68B (28-80mm USM I)
EW-73B (17-85mm USM, 18-135mm STM)
EW-83H (24-105mm USM)
ET-87 (70-200mm 2.8 IS II)
Canon Hoods that do NOT come with flocking:
EW-62 (35-135mm USM)
ES-62 (50mm 1.8 II)
ET-62 II (70-210 4.0)
EW-63C (18-55mm STM)
ET-63 (55-250mm STM)
ES-65 II (50mm 1.8 I)
ES-68 (50mm 1.8 STM)
EW-68A (28-70mm 3.5-4.5)
EW-73C (10-18mm STM)