For the first time I see Bitcoin Core suggesting a fee lower BTC/kVB 0.00001000 (or 1 Sat/vB)
In the 4 hours option (24 blocks) it suggests me 0.00000880 BTC/KVB (0.88 sat/vB)
Until these days, my bitcoin core wasn't allowing me to set the fee rate manually for values less than 0.00001 BTC/kvB, now I define to 0.000005 BTC/KvB (0.5 Sat/vB).

I'm in the updated version 29.0
My bitcoin.conf:
mintxfee=0.000001
minrelaytxfee=0.000001
fallbackfee=0.000001
paytxfee=0.000001