This is bug 1535196. Mike can use an AArch64 build of Fennec on Android Q to diagnose this bug.
Bug 1535867 Comment 29 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Comment 27 is bug 1535196. Mike can use an AArch64 build of Fennec on Android Q to diagnose this bug.