Ignore rolled-up progress values in formulas
When a formula uses the task progress value, it makes no distinction between manual (user-entered) progress values and rolled-up (calculated) values. If task roll-up is enabled in the same tree as a formula that reads progress values across descendants, this leads to incorrect results. A rolled-up task is treated as a manual task, resulting in double-counting and skewed averages. Preferably, the formula should ignore rolled-up progress values. At the moment I can't think of a use case for a formula that counts or calculates progress of both manual tasks and rolled up tasks.