Almost every other AOSP roms for S10 series have that issue. I have also searched through everywhere to way to increase it And no solution found so farThe version you mentioned.
But I have been experiencing the same issue also on previous PixelExtended 12 builds https://forum.xda-developers.com/t/...ryption-lineageos-recovery-supported.4399589/
So it's not a build issue, but rather a ROM issue.
Only one developer in another S10 rom has asked how much to increase in "DerpFest S - android 12.1" rom for S10 series.