I’ve had my FP4 since around June 2023. I installed LineageOS straight away and had high power consumption from the start. Most recently with lineage-21.0-20240529-nightly-FP4-signed.zip about 11-12 % in flight mode within 24 hours. So I started testing.
My finding is, that the last not draining version is lineage-20.0-20230514-nightly-FP4-signed.zip.