One difference is that you are on Android 10 and I’m still on Android 9. As the /e/ with Android 9 doesn’t support the new camera module downgrading to 9 isn’t really an option. I doubt that the problem is related to the Extended Length Function. That is more a configuration option and should either work or not and not cause a flaky result (but I am no expert).
Looking through the bug tracker I found: https://gitlab.e.foundation/e/backlog/-/issues/1501 Could you get the create get the log from your phone https://developer.android.com/studio/command-line/logcat (that is shortly after you have the problem with the NFC). Then we could see if it has the same source.