This bug has been around for a while so may have already been reported, but sometimes Reaper will show item lengths incorrectly.
What should be 4.0.0 measures, is displayed as 3.4.0 and won't show 4.0.0 regardless of how it's adjusted.
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FRs: v5 Media Explorer Requests,
Global Quantization,
Session View
Win10 Pro 64-bit, Reaper 6(x64), AMD 3950x, Aorus X570 Master, 64GB DDR4 3600, PowerColor Red Devil 5700XT, EVO 970 2TB, 10TB HD, Define R6