Same problem here - FP4 with Dutch physical SIM Vodafone and eSIM KPN, both (now) have data plans and work sometimes.
With both providers data connection is very unstable since 2 months.
Good signal but often I see an exclamation mark (uitroepteken) in the connectivity-symbol and no data.
I tried everything: reset APN and whole connection, switching the active data connection between both providers, manually choose connection and also try 2G, 4G and 5G.
Turning airplane/flight mode on and off again often gives shortly data, enough to exchange messages but seconds later connection is lost again.
WIFI works perfectly.