Building Qt plugin (TreeView) fails

Creaperdown

Hey, I am trying to build QtQuick.TreeView from here https://code.qt.io/cgit/qt-extensions/qttreeview.git/tree/. I am following the steps from the README.md but when trying to use QtQuick.TreeView 2.15 in my application, I get: plugin cannot be loaded for module "QtQuick.TreeView":
Failed to extract plugin meta data from '/usr/lib/qt/qml/QtQuick/TreeView/libqquicktreeviewplugin.so'

I am building my application with Qt 5.15 and running ldd on /usr/lib/qt/qml/QtQuick/TreeView/libqquicktreeviewplugin.so returns:

ldd libqquicktreeviewplugin.so
linux-vdso.so.1 (0x00007ffe4e4ca000)
libQt5Quick.so.5 => /usr/lib/libQt5Quick.so.5 (0x00007f4a7a45f000)
libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f4a79df6000)
libQt5QmlModels.so.5 => /usr/lib/libQt5QmlModels.so.5 (0x00007f4a79d75000)
libQt5Qml.so.5 => /usr/lib/libQt5Qml.so.5 (0x00007f4a79970000)
libQt5Network.so.5 => /usr/lib/libQt5Network.so.5 (0x00007f4a797ff000)
libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f4a792dc000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f4a79254000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f4a7901c000)
libm.so.6 => /usr/lib/libm.so.6 (0x00007f4a78f34000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f4a78f14000)
libc.so.6 => /usr/lib/libc.so.6 (0x00007f4a78d2d000)
libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f4a78cf4000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007f4a78cd8000)
libharfbuzz.so.0 => /usr/lib/libharfbuzz.so.0 (0x00007f4a78bde000)
libmd4c.so.0 => /usr/lib/libmd4c.so.0 (0x00007f4a78bc8000)
libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2 (0x00007f4a78b74000)
libssl.so.3 => /usr/lib/libssl.so.3 (0x00007f4a78ad4000)
libcrypto.so.3 => /usr/lib/libcrypto.so.3 (0x00007f4a78688000)
libsystemd.so.0 => /usr/lib/libsystemd.so.0 (0x00007f4a785aa000)
libdouble-conversion.so.3 => /usr/lib/libdouble-conversion.so.3 (0x00007f4a78594000)
libicui18n.so.72 => /usr/lib/libicui18n.so.72 (0x00007f4a78263000)
libicuuc.so.72 => /usr/lib/libicuuc.so.72 (0x00007f4a78062000)
libpcre2-16.so.0 => /usr/lib/libpcre2-16.so.0 (0x00007f4a77fd4000)
libzstd.so.1 => /usr/lib/libzstd.so.1 (0x00007f4a77f2c000)
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f4a77deb000)
/usr/lib64/ld-linux-x86-64.so.2 (0x00007f4a7a9d5000)
libGLdispatch.so.0 => /usr/lib/libGLdispatch.so.0 (0x00007f4a77d33000)
libGLX.so.0 => /usr/lib/libGLX.so.0 (0x00007f4a77d01000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f4a77c24000)
libgraphite2.so.3 => /usr/lib/libgraphite2.so.3 (0x00007f4a77c01000)
libkrb5.so.3 => /usr/lib/libkrb5.so.3 (0x00007f4a77b27000)
libk5crypto.so.3 => /usr/lib/libk5crypto.so.3 (0x00007f4a77af9000)
libcom_err.so.2 => /usr/lib/libcom_err.so.2 (0x00007f4a77af3000)
libkrb5support.so.0 => /usr/lib/libkrb5support.so.0 (0x00007f4a77ae5000)
libkeyutils.so.1 => /usr/lib/libkeyutils.so.1 (0x00007f4a77ade000)
libresolv.so.2 => /usr/lib/libresolv.so.2 (0x00007f4a77acc000)
libcap.so.2 => /usr/lib/libcap.so.2 (0x00007f4a77abe000)
libgcrypt.so.20 => /usr/lib/libgcrypt.so.20 (0x00007f4a77976000)
liblzma.so.5 => /usr/lib/liblzma.so.5 (0x00007f4a77943000)
liblz4.so.1 => /usr/lib/liblz4.so.1 (0x00007f4a77921000)
libicudata.so.72 => /usr/lib/libicudata.so.72 (0x00007f4a75b51000)
libpcre2-8.so.0 => /usr/lib/libpcre2-8.so.0 (0x00007f4a75ab4000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f4a75971000)
libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f4a7595e000)
libbrotlidec.so.1 => /usr/lib/libbrotlidec.so.1 (0x00007f4a75950000)
libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x00007f4a7592a000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f4a758fd000)
libbrotlicommon.so.1 => /usr/lib/libbrotlicommon.so.1 (0x00007f4a758da000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f4a758d5000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f4a758cd000)

Thus, it is using Qt 5 as well.
Does anyone have an idea why I get the error message? I know that some time ago I was able to use it. But when I rm -rf TreeView and rebuilt it by following the steps from the README.md, it did not work anymore.

Thanks for any help in advance

Creaperdown

I managed to fix it. Some days ago I replaced my linker (ld) with lld, I restored my old one and now it is working again