bdf font shows odd "glitch" on xterm

[terminalzeiro]

Cozette: 1.30.0
Cozette font file: cozettecrossedseven.bdf
OS: Debian GNU/Linux 13 (trixie)
XTerm: 398

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with my regular xterm setup

command line: xterm -fa '' -fn -inesw-cozettecrossedseven-medium-r-normal--0-0-75-75-m-0-iso10646-1

screencast-2025-12-30_19.34.09.mp4

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with vanilla xterm setup (the "glitch" remains):

command line: xterm -class NoClass -name no_name -fa '' -fn -inesw-cozettecrossedseven-medium-r-normal--0-0-75-75-m-0-iso10646-1 -e bash --norc

screencast-2025-12-30_20.07.40.mp4

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additional info

• other bdf fonts work, i. e. terminus
• previous cozette version also glitches
• X resources loaded on vanilla xterm instance: x11-resources.txt
• also tested with: -inesw-cozettecrossedseven-medium-r-normal--13-120-75-75-m-60-iso10646-11
• also tested with font file: cozette.bdf