insert_textbox rendering issue

[Andreasox]

Description of the bug

Glyphs with unicode 2000-200A are not rendered if used in the end of the string

How to reproduce the bug

According to #2970 I updated problematic glyphs (0-9 alternates) with Unicode codepoints in the range 2000-200F, see font https://www.dropbox.com/scl/fi/omdtevtwi9r6ps2ym2e44/GothamNarrow-Medium.otf?rlkey=bo7w24upjt9iopb8am51ks4ar&dl=0
insert_text seems to always render these digits correctly e.g. with:
shape.insert_text((286,157), '\u2001\u2001\u2001', fontname='GothamNarrow-Medium', fontsize=14.8)

insert_textbox will not render certain glyphs if ending the string with them, e.g.:
rect = Rect(197.5, 144.0, 397.5, 251.0)
shape.insert_textbox(rect, '\u2001\u200B\u2001', align=1, fontname='GothamNarrow-Medium', fontsize=14.8)

shape.insert_textbox(rect, '\u2001\u2001\u2001', align=1, fontname='GothamNarrow-Medium', fontsize=14.8)
and
shape.insert_textbox(rect, '\u2001\u2001\u2008', align=1, fontname='GothamNarrow-Medium', fontsize=14.8)
does not render any glyph at all

Is it possible to debug this confusing issue?
Is the range 2000-200A not possible to use with insert_textbox?
200B and above seems to work but have not tested all combos yet

PyMuPDF version

1.23.8

Operating system

MacOS

Python version

3.9

[JorjMcKie]

Can you provide the final font please - including your modifications?
Don't want to waste time experimenting around ...

[JorjMcKie]

Several reasons may be possible, like an error in the glyph bbox, etc.

[Andreasox]

Dropbox link to the font (not allowed to be attached as is): https://www.dropbox.com/scl/fi/omdtevtwi9r6ps2ym2e44/GothamNarrow-Medium.otf?rlkey=bo7w24upjt9iopb8am51ks4ar&dl=0

[Andreasox]

Realized that this may be a whitespace issue as the codepoints I selected are different kind of spaces (2000-200A).
I will test with other codepoints when time permits.

[JorjMcKie]

Ok I'll wait and mark this issue accordingly.

[JorjMcKie]

Thinking about it, for the time being this post is more a "Discussions" item than anything else.
Should we uncover a problem later, a more focused issue can be created.