I got curious and a regular old E-27 base is 1.03” Dia x 1.05” from the top of the screw to the tip. Old bulbs had a long neck and my guess is the socket makers didn’t worry much about how deep the socket was set into the lamp holder.
With these new bulbs being a molded base My guess is they are correct to spec for a E-27 but our old lamps are set too deep in some cases.
I wonder if you took the lamp apart if you could shim out the socket or trim down the housing.
Got 2 to work but noticed that the driver/ballast at the bottom of the bulb makes contact with the cardboard insulation before it's done toghtening down.
Shouldn't have to butcher my lamp to get them to work.