normal key input is falsly rejected by opposite shift mode

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Account name

FloFlower

Account config

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Current Behavior

While typing, i couldn't type the small 'i' key. There was no error, instead the input was simply rejected. when i spammed the key, a notification popped up saying: 'Opposite shift mode is enabled'.
Typing the i with either the right or left shift resulted in an error, after which the small i was still rejected.

Unfortunately, i don't know how to reproduce the issue. However, i have had this happen twice before.

Expected Behavior

When typing the small i, it is accepted and i can type the next letter

Steps To Reproduce

unknown

Environment

• OS: Windows 11
• Browser: Firefox
• Browser Version: version 154.0.1

Anything else?

No response

No source file, test, or entry point is named. Start by reproducing the report with opposite shift mode enabled on Windows 11 in Firefox, then trace the keyboard-input handling for the small “i” key; done means the key is accepted normally and a regression test covers the behavior.