fix(reflect): harden MakeFunc and method values on ctx-reg #1741

Job	Run time
setup	5s
populate-linux-sysroot	6s
build	7m 32s
test-artifacts (macos-latest, darwin, arm64, 1.24.2, 1.24)	2m 55s
test-artifacts (ubuntu-24.04-arm, linux, arm64, 1.24.2, 1.24)	1m 37s
test-artifacts (macos-15-intel, darwin, amd64, 1.24.2, 1.24)	9m 20s
test-artifacts (ubuntu-latest, linux, amd64, 1.24.2, 1.24)	1m 40s
release	-1s
	23m 14s

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