Lost key when keypresses overlap

See Mastodon thread: https://chaos.social/@fizzo/113038978825725074

When typing quickly on the keyboard, two keypresses may overlap; in this case the second key gets lost.

I have tested this on squeekboard and an iPhone 12 mini for comparison and both work as expected (both keys are registered).

Example:

• Key A press
• Key B press
• Key A release
• Key B release

Current behaviour: Key B is lost and only key A is registered
Expected behaviour: Key A and key B are both registered

Tested on oneplus-enchilada with postmarketOS edge + phosh 0.41.0-r0 + phosh-osk-stub 0.41.1-r0