How does search in the "Choose Application Settings" window work?

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When creating screenshots for the “Solutions” section of Doesn't run at boot. · Issue #134 · flathub/ch.protonmail.protonmail-bridge · GitHub, I noticed something really strange:

Screenshot_20240419_164325 Screenshot_20240419_164318 Screenshot_20240419_164311

all work. However,

Screenshot_20240419_164304

doesn’t! Huh?