Expose and fix mistranslation from python that can lead to bad avar #3008

Job	Run time
resources/scripts/ots_test.sh	1m 8s
Rustfmt	1m 11s
Build GS and check the result	3m 5s
cargo check no std	1m 28s
cargo test fea-rs	1m 7s
Clippy lints	1m 42s
fontbe tests	52s
fontc tests	1m 16s
tests other than fontbe,fontc	2m 16s
	14m 5s

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