I think try might have some debug logging enabled. When I use {{ $width := (try $resource.Width) }} I get a bunch of logging of what looks like the SubType of the resource

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What version of Hugo are you using (hugo version)?

hugo v0.142.0-1f746a872442e66b6afd47c8c04ac42dc92cdb6f+extended windows/amd64 BuildDate=2025-01-22T12:20:52Z VendorInfo=gohugoio

Does this issue reproduce with the latest release?

Yes