So.
I will try to explain again.
First, on FCX 2019-1, I launched different color schemes.
And the column "Name" constantly changed its appearance.
--FCX-2019-1--
Your color scheme is "White_Default" and the option "Show extension in "Name" column":
option enabled / option disabled
Any other color scheme of yours and the option "Show extension in "Name" column":
option enabled / option disabled
--FCX-2020-1--
Your color scheme is "White_Default" and the option "Show extension in "Name" column":
option enabled / option disabled
Any other color scheme of yours and the option "Show extension in "Name" column":
option enabled / option disabled
But several times (I could not repeat it, on White_Default.colors) with FCX 2019-1 and the option "Show extension in" Name "column"): And this was the appearance of the "Name" column:
option enabled / option disabled
Perhaps (IMHO) is this some kind of bug with positioning .EXT in the "Name" column?
(I hope now I’ve written this text more clearly)
(I know that I am too verbose and hard to understand...)