I also have  20220.01 on my M1 Mac so have done a little digging.

Getting rid of all the extraneous translates/rotates

font="Marker Felt:style=Thin";
fontsize=10;
letter="j";
width=11;
tileheight=1;

cube ([14,14,1]);
linear_extrude(height=6) text(letter,size=fontsize, font=font);

The J is present with F5 and disappears with F6.
Make the J and cube discontinuous also makes no difference

Comment out the cube and the J is present with both F5 and F6.

Adding the Offset suggested fixes the problem

linear_extrude(height=6) offset(0.001) text(letter,size=fontsize, font=font);

If I switch to OpenScad 2021.02.08 it then gives the error

Rendering Polygon Mesh using CGAL...
ERROR: The given mesh is not closed! Unable to convert to CGAL_Nef_Polyhedron.

Geometries in cache: 5

Geometry cache size in bytes: 89224

CGAL Polyhedrons in cache: 2

CGAL cache size in bytes: 461088

Total rendering time: 0:00:00.045

Top level object is a 3D object:

Simple: yes

Vertices: 8

Halfedges: 24

Edges: 12

Halffacets: 12

Facets: 6

Volumes: 2

Rendering finished.

cheers
Bob.C

Interesting.  Then why does the "J" appear with both F5 and F6 on my
Windows system using version 2021.01

Jon

On 5/29/2021 12:14 PM, Torsten Paul wrote:

On 29.05.21 18:26, jon wrote:

Did you install exactly the same font, e.g. the "thin" variant?
I used that one: https://ufonts.com/download/marker-felt-thin.html

Those kind of issues are often very specific and not necessarily
affect all font variants.

ciao,
Torsten.

Ah.  Good point.  I guess when there is an inexact font match, the
system goes with the nearest best, without a warning message.

Jon

On 5/29/2021 12:29 PM, Torsten Paul wrote:

make a little offset and it will render (F6).
like so:
cube ([14,14,1]);
linear_extrude(height=6) offset(0.001) text(letter,size=fontsize,
font=font);

Am Sa., 29. Mai 2021 um 18:15 Uhr schrieb Torsten Paul <Torsten.Paul@gmx.de

Can someone contact the administrator and ask to have my email removed from the mailing list? I've tried twice on-line with no success.
Thank you,
David M

On Saturday 29 May 2021 16:29:22 DAVID MENDALSKI wrote:

Did you reply in the affirmative to the message the server sent to the
address on record?

Cheers, Gene Heskett

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Genes Web page http://geneslinuxbox.net:6309/gene

On 5/29/2021 9:31 AM, jon wrote:

Yes, that's an explicit design feature of the fontconfig library used.

https://www.freedesktop.org/software/fontconfig/fontconfig-user.html#AEN25

Fontconfig performs matching by measuring the distance from a
provided pattern to all of the available fonts in the system. The
closest matching font is selected. This ensures that a font will
always be returned, but doesn't ensure that it is anything like the
requested pattern.

Sometimes it's what you want.  Sometimes not so much.