Recently while trying to filter the Combo box Items using the value of the Global Multi-choice field, we were getting issues in the formula.
It was because the optionset / choice field in the table and the global optionset / choice, it was referring to, both were having the same display name.
To get it working we renamed the display name of the Global Choice column.
After which we were able to get our formula working.
Same is the case for the single choice field which is referring to global choice.
Gender is the display name of the field in Lead and Global Gender is the display name of the global choice field.
Hope it helps..
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