Curved placement label not shown for feature

[strk]

What is the bug or the crash?

label with "curved" placement does not show when zooming out, see how the label for the black line is missing:

And shows up if I zoom in:

It feels like the labeling engine really wants the text to completely fit into a single segment of that black feature, while this isn't the case with other features, like the yellow one where the label spans 3 segments. Could it be the last segment is special ?

Steps to reproduce the issue

1. go to layer properties, labels
2. select Single Labels and pick an attribute with some long text
3. pick Curved mode placement allowing all positions
4. Zoom in and out and see how the label disappears too soon

Versions

QGIS version	3.41.0-Master
QGIS code revision	b601cc7a6e5
Libraries
Qt version	5.15.8
Python version	3.11.2
GDAL/OGR version	3.4.3
PROJ version	9.1.1
EPSG Registry database version	v10.076 (2022-08-31)
GEOS version	3.14.0dev-CAPI-1.20.0
SQLite version	3.40.1
PostgreSQL client version	unknown
SpatiaLite version	5.1.1-rc0
QWT version	6.1.4
QScintilla2 version	2.13.3
OS version	Debian GNU/Linux 12 (bookworm)
This copy of QGIS writes debugging output.
Active Python plugins
QuickWKT	3.1
MetaSearch	0.3.6
db_manager	0.1.20
processing	2.12.99
grassprovider	2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[strk]

Note that "Parallel" placement doesn't omit the label at the same or even bigger scale:

[nyalldawson]

@strk check the settings for maximum angle between curved characters, label overrun