BUG: fix reading coordinates in `Fargo3DReader.read` #1805

Job	Run time
Image tests	21s
type-checking (3.9)	33s
tests (ubuntu-latest, 3.9, bin)	1m 1s
type-checking (3.10)	30s
tests (ubuntu-latest, 3.10, bin)	58s
type-checking (3.11)	30s
tests (ubuntu-latest, 3.11, bin)	58s
type-checking (3.12)	36s
tests (ubuntu-latest, 3.12, bin)	1m 13s
type-checking (3.13)	39s
tests (ubuntu-latest, 3.13, bin)	1m 25s
tests (ubuntu-20.04, 3.9, bin, minimal, --resolution=lowest-direct)	1m 17s
tests (macos-latest, 3.13, bin)	51s
tests (windows-latest, 3.13, Scripts)	2m 40s
docs	14s
Combine coverage reports	10s
	13m 56s

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