Custom keyboards don't show when opening Blink

When using keyboards other than the iOS default (e.g. Swipe) no keyboard is displayed at all, when opening Blink. Putting Blink in the background and opening it again does display the keyboard.

This only appears to happen when blink is protected with a key/touchid.

Start by reproducing the first-launch flow on iOS with a non-default keyboard and key/Touch ID protection, then compare it with reopening Blink from the background. Done means the custom keyboard appears when Blink initially opens while protection is enabled.

Written by the indexing model from the issue text.