In the View filters the filters show that “Remaining” includes “blocked” projects but “Available” does not. However I can’t find anywhere where something could be set to “blocked”. There is active, dropped, complete, on hold.
An action is blocked if it’s not the next available action in a sequential project/group. For example, if you had a sequential project called “Replace Filter in Furnace” that had the following actions:
Action 1 - Check type of furnace filter
Action 2 - Buy new filter
Action 3 - Replace filter
Initially only Action 1 would be available and Action 2 and Action 3 would be blocked. Once Action 1 is marked complete, Action 2 would become available and Action 3 would be blocked. And when Action 2 is completed, Action 3 would become available, removing any blocks.