I accidentally found out that enabling “show taps” in Android developer settings soft bricks AppSupport (at least with AppSupport 11 on a Xperia 10 iii). It leads to every Android app instantly crashing upon touch input.
I had to wait until I had access to an external keyboard again before I was able to disable the setting and resolve the issue.
Since this is quite an obscure problem I doubt it’s worth filing a bug report for?