Input boxes handle keypresses inconsistently
This is an intermittent bug.
When typing in input boxes I find that performance can be inconsistent. Sometimes, the cursor will jump to the end of the string inside the box, so I end up appending after the unit (e.g. "406 px+7"), which then errors.
Another example is the input box just not inserting characters at all. It seems especially prone to missing arithmetic characters such as + or - or /. For example, I meant to type "300+100 px" but instead it ignores the plus and displays "300100 px", which then error because it's too big.
I've attached a gif of some of the behaviour, but it's hard to catch the error when I'm recording the screen, so couldn't display the missing character case.

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Felix, can you tell if this behavior is still an issue with recent versions?
I’d say I’m having this occasionally, but not when using arithmetic operation, the cursor is mostly get placed at the end instead of selecting the value on pressing Tab. But rarely.