in the latest luametatex version, \the\font does ... something weird:
E.g. with a current, fully updated lmtx, I get for


the output

> }\ifempty \currentstyleparameter \else \dousecurrentstyleparameter \fi

instead of the expected

> \3>modern-designsize-12pt-rm-tf-0--0

(or similar)

(given that this contains an unmatched `}`, it causes havoc if \the\font
is used in unsuspecting macro code.)

Best regards,
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