Applying Bryan’s explanation he gave me here - Template-->Theme-->text_font. Putting it all together - #3 by Bryan , the reason your code isn’t behaving as intended is indeed as I suspected, but there’s a way easier fix than my suggestion/rewrite above.
Just replace:
fig2.rect(x=col, y="index", .....
with
fig2.rect(x=dict(value=col), y="index",
