Pre-jump is sometimes skipped

[AtlasLinden]

Environment

Second Life Release 7.1.14.15192634334 (2024.04)

Description

When holding down the jump button in a no-fly area, the pre-jump animation is sometimes skipped.
https://gyazo.com/92ab3f5681bde217f07b36c6bdd78a98

This is impacting the longstanding Pony Play community, as detailed in https://feedback.secondlife.com/bug-reports/p/disable-waiting-for-pre-jump-and-landing-setting-not-working

This issue also does not appear to occur on pre-PBR viewers including FS 6.6.17 and the LL GHA viewer 6.6.16.6566955269.

This pre-jump animation skip appears to line up with causing #4217. That is, when the pre-jump doesn't occur whilst jumping on an object, a super jump is observed. This can be confirmed instantly while enabling Firestorm's "Disable waiting for pre-jump and landing animation" setting.

Reproduction steps

1. Go to a no-fly parcel/region or set one accordingly.
2. Hold down the jump key

[canny]

This issue has been linked to a Canny post: "Disable waiting for pre-jump and landing" setting not working 🎉