That was close, you managed to edit it and fix the original "it does not work" report before it was too late
I fixed obviously wrong variable (priority vs bootpriority) and apparently it was originally (many, many years ago..) supposed to be -128 (no boot) but because it was wrong variable, actual boot priority default become 0. And of course I didn't bother to test it too much because it was so obvious and then forgot about it as usual