Moving or lengthening the spline in UE5.1 slows it down excessively. UE5.1 Spline Bug

Hello @Astrotronic, thank you very much. Maybe i dont understand this, but this fix is in the release branch and it was added 28 OCT. Is it not included in the 15 NOV release? I thought the official runtime package was made from this release branch - including this FIX… but im not very advanced so sorry if i dont understand this correctly