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fix: preserve legacy path bytes and repair tag, tree and ref edge cases #3091

Job	Run time
install/import (macos-latest, 3.8)	1m 2s
install/import (ubuntu-latest, 3.10)	11s
install/import (windows-latest, 3.8)	1m 4s
test (ubuntu, 3.15)	5m 5s
install/import (ubuntu-latest, 3.9)	6s
install/import (windows-latest, 3.9)	50s
install/import (macos-latest, 3.10)	30s
install/import (macos-latest, 3.9)	34s
install/import (windows-latest, 3.10)	1m 5s
install/import (ubuntu-latest, 3.8)	7s
test (ubuntu, 3.14t)	5m 14s
test (windows, 3.13)	8m 59s
test (windows, 3.15)	9m 8s
test (ubuntu, 3.14)	4m 40s
test (macos, 3.13)	10m 18s
test (ubuntu, 3.13)	5m 7s
test (ubuntu, 3.12)	4m 21s
test (macos, 3.12, gix)	7m 46s
test (ubuntu, 3.11)	3m 36s
test (macos, 3.12)	9m 2s
test (ubuntu, 3.15t)	3m 58s
test (macos, 3.11)	8m 6s
test (windows, 3.12)	2m 48s
test (windows, 3.15t)	7m 25s
test (windows, 3.11)	1m 22s
test (ubuntu, 3.12, gix)	8m 56s
test (macos, 3.14)	8m 56s
test (macos, 3.15)	4m 1s
test (windows, 3.14t)	8m 36s
test (windows, 3.14)	3m 57s
test (windows, 3.12, gix)	8m 56s
	2h 25m 46s