I am not clear on your overall scheme. Your Plan bar (blue) uses conditional formatting based on starting on the Plan date in column E and ending on the plan date in column BM. Your Forecast bar (black) does the same thing for columns J to BR. This by itself doesn't make sense to me because you have a lot of dates in between on row 21 that you seem to be ignoring.
I am going to try and guess at what you want to do but I think you should rethink the whole solution.
To do the same thing for your Complete dates, you need to do something similar but look at the earliest and latest Complete dates, instead of the first and last.
Also note that in your example, something is mismatched. Your Complete bar starts on 11/19/2019 but your first Complete date is 11/19/2020, so your earliest Complete date is 12/9/2019.
Anyway, I have been a systems development project manager for over 30 years and I don't understand what you are trying to show in this Gantt chart.
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