ERC incorrectly marks stacked NC pins as connected

Descript_on_

EDIT: after triage with @cpresser this seems like a KiCAD bug, not a KLC issue:

From the documentation (https://docs.kicad.org/9.0/en/eeschema/eeschema.html):

When multiple pins of type unconnected are stacked in a symbol, they are connected to separate nets, whereas stacked pins of other types are connected to the same net.

If invisible N/C pins are stacked per KLC recommendation/alternate solution, I get ERC warnings: (warnings appeared after an update somewhere between v9.0.1 and 9.0.6):

"Pin with 'no connection' type is connected"

Original Text:

Per KLC S4.5 it is allowed, to omit pins from symbols, if they are never to be connected.

This causes warnings, when 'Update PCB from Schematic':

"Warning: No net found for [component] pad [pad] (no pin [pin] in symbol)"

To avoid the warnings, currently the best solution is something like:

Which in the best case makes the symbol not clean/hideous,
AND would make a smaller symbol unnecessarily large.

Proposal

I would appreciate a more space-saving/elegant way, of specifying (drawing) unconnected pins in the symbol.

Stacking~~ Unconnected pins are not allowed to be stacked, per KLC S4.3.~~

KiCad Version

Application: KiCad PCB Editor x86_64 on x86_64 Version: 9.0.6+1, release build Libraries: wxWidgets 3.2.8 FreeType 2.13.3 HarfBuzz 10.2.0 FontConfig 2.15.0 libcurl/8.16.0 OpenSSL/3.5.1 zlib/1.3.1 brotli/1.1.0 zstd/1.5.7 libidn2/2.3.8 libpsl/0.21.2 libssh2/1.11.1 nghttp2/1.64.0 ngtcp2/1.16.0 nghttp3/1.12.0 librtmp/2.3 OpenLDAP/2.6.10 Platform: Debian GNU/Linux 13 (trixie), 64 bit, Little endian, wxGTK, X11, lightdm-xsession, x11 OpenGL: AMD, AMD Radeon Graphics (radeonsi, renoir, ACO, DRM 3.64, 6.16.3+deb13-amd64), 4.6 (Compatibility Profile) Mesa 25.2.6-1~bpo13+1 Build Info: Date: Nov 10 2025 15:10:44 wxWidgets: 3.2.8 (wchar_t,wx containers) GTK+ 3.24 Boost: 1.83.0 OCC: 7.8.1 Curl: 8.14.1 ngspice: 44.2 Compiler: GCC 14.2.0 with C++ ABI 1019 KICAD_IPC_API=ON Locale: Lang: en_US Enc: UTF-8 Num: 1,234.5 Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)