It's a bug in the keyboard :(

Sorry to bother you, thanks for responding. You are doing gods work. More SATs coming your way as I can manage it. ;)

Do you know why it only seems to impact amethyst?

We use a new UI lib called Jetpack Compose. Their keyboard doesn't seem ready for it.

Just an FYI GrapheneOS doesn't have its own Keyboard. The Keyboard that comes as default is the baseline AOSP Keyboatd. This seems like a very niche issue for it though, however personally I use Florisboard. Wh8ch is a candidate to replace the AOSP KB when it reaches a mature enough point and is feature complete.

can you type "" in next line？ I think it is a bug. when you type this symbol with no words at the end of a sentence, the cursor backspace ，jump to former space .when type this symbol next line,it jump to upper line. It can be now inserted into a sentence whenboth side have words. like this,blank above. v0.26.2

As an update after doing some digging the issue was raised with Google and acknowledged relating to Jetpack Compose:

Google Issue Tracker

In the connected issues from that and connecting the dots they apparently fixed the problem with 1.3.0-alpha3 foundation unless I missed a dot.