As title. The correct redstone value gets detected by blocks when they're placed against the connector-powered block, or when already attached blocks get prompted to update (by say, a neighboring block update)
This works for both powering and depowering

This is also related to the cloche issue from the server-discussion channel

to recreate, create structure shown in picture, flip the lever as last course of action. The piston powered through the Grass block can be forced to update i.e. by placing a block next to it

Update:
This bug was introduced in build # 24
The same setup still works without issue in build # 23

Edit:
specifically this line change:
extra special link because stupid # parses

f960c3e