This appears to still be an issue in 1.18.1. The hopper underneath unloads items so quickly the hopper above can't trigger the comparator. Workaround is to use the comparator on the bottom hopper in the stack and send the signal up from there to the powered rail.
Drew Skau
This appears to still be an issue in 1.18.1. The hopper underneath unloads items so quickly the hopper above can't trigger the comparator. Workaround is to use the comparator on the bottom hopper in the stack and send the signal up from there to the powered rail.