[AnimationPlayer] Playing an animation backwards with play("", -2, -1) triggers method tracks out of turn

[LakshayaG73]

Tested versions

v4.2.1.stable.official [b09f793]

System information

Windows 11

Issue description

Triggering an animation backwards plays all method tracks out of turn.

Steps to reproduce

• Play the scene in the MRP
• You will see that the trigger method gets called out of turn

Minimal reproduction project (MRP)

Animation MRP.zip

[LakshayaG73]

So, this is not at all explained in the documentation, but switching the sign of 'custom_blend' option to positive, while playing backwards, seems to fix the issue.

Not sure if this is by design. If so, it should be documented. If not, just FYI.

[LakshayaG73]

Fixed in v4.3.dev.custom_build [7199765d9] via #86227