button uit scherm bij wijzigen SoC bij vertrek op android telefoon

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(switch to english, button name in Dutch) when creating a route, I want to change the SoC by start (not the default one). When the screen opens (see screen 1bitmap). Button ("done" in English) is visible.
After entering a new value for SoC the button disappers (see bitmap 2). For new I have to change the default value to bypass this bug.