Originally came up with this issue in the late 1.13 snapshots, but never bothered to make a ticket on it until today.
Create the setup shown in the screenshots and try placing a sign against the side of the torch. Since it cannot be placed there it defaults to the side of a neighbouring block, another valid position. However, trying to place an item frame or painting using this trick will fail entirely instead of using the alternative valid placements.
Hi there!
I can confirm for release 1.16.2.