When in creative or survival and theres an effect applied to the player (screen shot affect is by beacon). The status goes blank when nothing is selected (see screen shots). Note with multiple affects (such as eating the golen apple) the bug seems to go away. Will update when the apple affects wear off
Note I did a search and the only thing that comes close is the text color changing when an enchanted item is selected bug.
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duplicates 1
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Duplicate of MC-36255

which duplicates MC-35643
yep
sorry did not see that one in my search. Thanks