In 1.15.2 if a command block with this command
- execute if @a[xyz] (so count the number of players in a certain area)
is connected to a comparator the redstone output is always 1 even if there are more player in these area
For example if there were 3 players the redstone signal created by the comparator should be 3 blocks.
In 1.14 it worked.
Thanks for your attention.