Backspace does not work correctly in some applications

[2ip1]

Describe the bug

In some apps or websites the backspace key stops working or does not work for certain actions. e.g. in Logseq an empty line cannot be deleted. Deleting content works as expected.

This issue was also reported in Openboard: https://github.com/openboard-team/openboard/issues/729 @bgvaughan reported that there are also issues in HedgeDoc (which I was able to reproduce with HeliBoard) @enos-ape reported that the wrong JavaScript keycode is being sent

To Reproduce

1. Download Logseq
2. Open the app
3. Write a line, hit enter, and try deleting the new block with backspace
4. Lines without content cannot be deleted

Expected behavior

If i press backspace in an empty line, the line should be removed. This works in other keyboards (e.g. swiftkey)

Screenshots

App version

HeliBoard 1.0-alpha1

Device (please complete the following information):

• Model: Google Pixel 6a
• OS: Android 14 (Graphene OS)