Had a chance to do some testing, and I have to say results are weird
Conditions:
1. TOU is checked
2. Grid Charge and Gen are checked next to time interval in question, with Power 0 and Batt 85%
3. When grid disconnected battery SOC was 100%
Outcome:
Smart Load was feeding small appliance (fan, consumes 8W per spec, Deye tells 16 something) for some time (hours) and then switched off. Honestly I'd be expecting Smart Load to be off asap in my condition (no PV), so I was surprised it was on for so long, but also was surprised it disconnected for no apparent reason (battery did not reach 85% SOC by far)