Unexpected behavior of "Fill Above" and "Fill Below" in profile tool

[fiddlersfan]

What is the bug or the crash?

If you use a raster with nan values in the new profile tool, they will be displayed correctly in the line view. In those places a gap is displayed. In the "Fill above" and "Fill below" mode, however, the nan values are not displayed as a gap but a continuous polygon is created. Here I would actually expect that the space in between with nan values remains empty and only the space below real values is filled.

"Line":

"Fill Below":

Steps to reproduce the issue

1. Load any raster data with nan values into qgis
2. Draw the profile section through areas with values and with nan values
3. Switch "Profile Chart Appearance" between "Line" and "Fill below"

Versions

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QGIS-Version	3.32.2-Lima	QGIS-Codeversion	c0b8833
Qt-Version	5.15.3
Python-Version	3.9.5
GDAL-Version	3.7.1
PROJ-Version	9.2.1
EPSG-Registraturdatenbankversion	v10.088 (2023-05-13)
GEOS-Version	3.12.0-CAPI-1.18.0
SQLite-Version	3.41.1
PDAL-Version	2.5.5
PostgreSQL-Client-Version	15.2
SpatiaLite-Version	5.1.0
QWT-Version	6.1.6
QScintilla2-Version	2.13.1
BS-Version	Windows 10 Version 2009
Aktive Python-Erweiterungen
Coordtransform	1.1
latlontools	3.6.4
mup_functions	0.5
plugin_reloader	0.9.1
profiletool	4.2.2
qfieldsync	v4.1.1
QuickOSM	2.0.1
searchlayers	3.0.10
db_manager	0.1.20
MetaSearch	0.3.6
processing	2.12.99

QGIS-Version 3.32.2-Lima QGIS-Codeversion [c0b8833](https://github.com/qgis/QGIS/commit/c0b8833964) Qt-Version 5.15.3 Python-Version 3.9.5 GDAL-Version 3.7.1 PROJ-Version 9.2.1 EPSG-Registraturdatenbankversion v10.088 (2023-05-13) GEOS-Version 3.12.0-CAPI-1.18.0 SQLite-Version 3.41.1 PDAL-Version 2.5.5 PostgreSQL-Client-Version 15.2 SpatiaLite-Version 5.1.0 QWT-Version 6.1.6 QScintilla2-Version 2.13.1 BS-Version Windows 10 Version 2009

Aktive Python-Erweiterungen
Coordtransform
1.1
latlontools
3.6.4
mup_functions
0.5
plugin_reloader
0.9.1
profiletool
4.2.2
qfieldsync
v4.1.1
QuickOSM
2.0.1
searchlayers
3.0.10
db_manager
0.1.20
MetaSearch
0.3.6
processing
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