Wrong parsing / rendering for operator<=> (in Dark themes)

A three-way (spaceship) operator in a C++20 project does not seem to get lexed properly by Qt Creator.

This causes operator<=> to be misrendered when using JetBrains Mono:

This only seems to happen when using a Dark theme.

I suspect the lexer is somehow splitting the parsing of the operator and yielding two slightly different char formats for the editor, which block the ligature from kicking in.