Decompress chunk where shouldnt be

Question

I have an Ignition installation feeding into a Postgres DB with TimescaleDB. The setup is as follows :

• Postgres 15
• Hypertable with 100 parallel chunks, 12h interval
• Autocompression set to 24h

In theory, no data should need to be decompressed, unless I query > 24h from now, yet, when I do this :

EXPLAIN ANALYSE 
SELECT 
    "tagid","intvalue","floatvalue","stringvalue","datevalue","t_stamp","dataintegrity" 
FROM 
    sqlth_1_data 
WHERE  
    "t_stamp">cast(extract(epoch from now()) - extract(epoch from INTERVAL '4 hours') as BIGINT)*1000 
ORDER BY 
    "t_stamp" DESC

I get a slow query that decompresses chunks, same if I try with 10 minutes. Is my query wrong ? Or is the setup wrong ?