I'm seeing a similar but intermittent failure with arm32 on the Raspberry Pi, 
running Richard Miller's build.
Just occasionally I see the "out of sync" message - always so far with 
apparently equal number pairs reported (though different each time). It might 
be unrelated.

term% fpnote2
start counting
.postnote
postnote done
floatnote mynote
out of sync 687926779 687926779
term%

and another with:

.......floatnote interrupt
.floatnote interrupt
out of sync 39461826279152 39461826279152

when I hammered on the DEL key.

One time I've also seen it get stuck in a loop producing:

term% fpnote2
start counting
.postnote
postnote done
floatnote mynote
floatnote sys: trap: fault read va=0x11104 pc=0x1604
floatnote sys: trap: fault read va=0x11104 pc=0x1604
floatnote sys: trap: fault read va=0x11104 pc=0x1604
floatnote sys: trap: fault read va=0x11104 pc=0x1604
....
Hitting DEL seemed to snap it out of it, and it completed successfully after a 
while...

I tried replacing the print() call in the note handler with write()s, because I 
was suspicious that it might do some illicit FP, but that had no effect. The 
problem still happens.

7c on the arm64 with 9front seems not to show this problem.
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