`cursor_blink_interval` with an easing function doesn't work with `background_opacity`

[Petrusion]

Describe the bug
If cursor_blink_interval is set to some positive number without an easing function and background_opacity is set to less than 1, the cursor correctly disappears and reappears.

However, when an easing function is used for cursor_blink_interval (linear, ease-in-out, etc..) it won't actually animate just the alpha / opacity of the cursor, but its entire color from "visible cursor" to background color. That is, on a black background with some background_opacity, the cursor will go from being fully visible, to being invisible, overshoot and turn black and opaque, then do that in reverse.

Also, in some instances of kitty, a slightly different issue happens, it will start animating, go from white straight to black, and then instantly back to white again (without ever being invisible). I unfortunately can't tell what is causing it to "pick which way it will break".

(as I am writing this, all of a sudden I can only get the second problem... maybe that means it depends on some system state?)

To Reproduce
Steps to reproduce the behavior:

1. run kitty --config NONE -o "background_opacity 0.5" -o "cursor_blink_interval 2 ease-in-out"
2. see that one of the two described issues should happen

Screenshots
(it wasn't my intention to slow down the gif, it just rendered that way for some reason)

Environment details

kitty 0.39.1 created by Kovid Goyal
Linux petr-pc 6.12.15-xanmod1 #1-NixOS SMP PREEMPT_DYNAMIC Tue Jan  1 00:00:00 UTC 1980 x86_64

<<< Welcome to NixOS 24.11.20250301.5ef6c42 (x86_64) - /dev/tty >>>

Run 'nixos-help' for the NixOS manual.

DISTRIB_CODENAME=vicuna
DISTRIB_DESCRIPTION="NixOS 24.11 (Vicuna)"
DISTRIB_ID=nixos
DISTRIB_RELEASE="24.11"
LSB_VERSION="24.11 (Vicuna)"
Running under: Wayland (kwin 6.2.5) missing: single_pixel_buffer
OpenGL: '3.1.0 NVIDIA 565.77' Detected version: 3.1
Frozen: False
Fonts:
  medium: Hack-Regular: /nix/store/25c3chkpvqabqhixyqp89c4q49fgm0va-hack-font-3.003/share/fonts/truetype/Hack-Regular.ttf:0
          Features: ()
    bold: Hack-Bold: /nix/store/25c3chkpvqabqhixyqp89c4q49fgm0va-hack-font-3.003/share/fonts/truetype/Hack-Bold.ttf:0
          Features: ()
  italic: Hack-Italic: /nix/store/25c3chkpvqabqhixyqp89c4q49fgm0va-hack-font-3.003/share/fonts/truetype/Hack-Italic.ttf:0
          Features: ()
      bi: Hack-BoldItalic: /nix/store/25c3chkpvqabqhixyqp89c4q49fgm0va-hack-font-3.003/share/fonts/truetype/Hack-BoldItalic.ttf:0
          Features: ()
Paths:
  kitty: /nix/store/xgzff4yjc91z03bmr9v1vscz9pyc1hic-kitty-0.39.1/bin/kitty
  base dir: /nix/store/xgzff4yjc91z03bmr9v1vscz9pyc1hic-kitty-0.39.1/lib/kitty
  extensions dir: /nix/store/xgzff4yjc91z03bmr9v1vscz9pyc1hic-kitty-0.39.1/lib/kitty/kitty
  system shell: /run/current-system/sw/bin/fish
System color scheme: dark. Applied color theme type: none

Config options different from defaults:

Important environment variables seen by the kitty process:
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Additional context
None needed, the issue happens with --config NONE.