The player's shadow flickers when walking and running. This bug appeared suddenly. By searching, I realized that this bug is created by the "experimental_sign_text_buffering" option. When you turn it off, the bug disappears, but without it, the fps drops to bad values ​​in busy areas, where there are signs and frames.

logs.zip

P.s. I recorded this bug on video, but when I upload it here, an error occurs

Could not reproduce the issue. Please record a video and provide exact steps to reproduce the issue

You have many mods installed. Try reproducing the issue with only ImmediatelyFast installed

Tested with iris, sodium (sodium extra and reese's sodium option were also there). This bug is still present with the "experimental_sign_text_buffering" option enabled. Without this option everything is perfect, but the fps drops. This option gives a good increase in fps, but the shadow bug is annoying.

P.s. We tested the mod again, only this time I was not alone, and made a conclusion. The "experimental_sign_text_buffering" option does not bug only when entity shadows are disabled on shaders. If entity shadows are enabled, then the player's shadow and nearby entities will start to flicker. And this is on any shaders. In general, the "experimental_sign_text_buffering" option works strangely and because of it you have to sacrifice disabling entity shadows, leaving only the player's shadow.

Thank you for the extra details. I am going to look into fixing it when I have time.

1. I set the parameter "experimental_sign_text_buffering" to true

2. I enable the parameter Entity Shadows in the Lightning settings of the ComplementaryReimagined shader

3. When moving, the player's shadow flickers

Here is a link to a video recording of this bug:
https://youtu.be/g2jg4pH1s6g?si=OsHbBkALv0RR15V-