In RStudio version 1.1.463, running on Windows 10, the following tibble is not displaying consistently.
# A tibble: 1 x 1
word
<chr>
1 field
"fi" displays in the console pane as "fi"
but as "<U+FB01>" in the viewer and environment panes
The same issue for "fl".
dput(x)
structure(list(word = "field"), row.names = c(NA, -1L), class = c("tbl_df",
"tbl", "data.frame"))
#> word
#> 1 field
Editor font is set as Lucida console, and theme is modern